From 96eab1202717e073782ec399a4e0820cae15b1bb Mon Sep 17 00:00:00 2001
From: Christopher Speller <crspeller@gmail.com>
Date: Thu, 17 Aug 2017 17:19:06 -0700
Subject: Updating server dependancies. (#7246)

---
 vendor/gopkg.in/gomail.v2/.travis.yml              |   1 -
 vendor/gopkg.in/gomail.v2/README.md                |  43 +++--
 vendor/gopkg.in/gomail.v2/auth.go                  |  52 ++++--
 vendor/gopkg.in/gomail.v2/auth_test.go             |  88 +++++++--
 vendor/gopkg.in/gomail.v2/example_test.go          |  14 +-
 vendor/gopkg.in/gomail.v2/message.go               |  96 ++++------
 vendor/gopkg.in/gomail.v2/message_test.go          | 177 +++---------------
 vendor/gopkg.in/gomail.v2/mime.go                  |   6 +-
 vendor/gopkg.in/gomail.v2/mime_go14.go             |  13 +-
 vendor/gopkg.in/gomail.v2/send.go                  |  11 +-
 vendor/gopkg.in/gomail.v2/smtp.go                  | 125 +++++--------
 vendor/gopkg.in/gomail.v2/smtp_test.go             | 118 ++++--------
 vendor/gopkg.in/gomail.v2/writeto.go               |  96 ++--------
 vendor/gopkg.in/olivere/elastic.v5/client.go       |   9 +-
 vendor/gopkg.in/olivere/elastic.v5/client_test.go  |  16 +-
 vendor/gopkg.in/olivere/elastic.v5/retry_test.go   |   6 +-
 vendor/gopkg.in/olivere/elastic.v5/run-es-5.5.1.sh |   1 +
 .../olivere/elastic.v5/search_aggs_bucket_terms.go | 110 ++++++-----
 .../elastic.v5/search_aggs_bucket_terms_test.go    |  51 +++++
 vendor/gopkg.in/yaml.v2/LICENSE                    | 208 ++++++++++++++++++++-
 vendor/gopkg.in/yaml.v2/README.md                  |   2 +
 vendor/gopkg.in/yaml.v2/decode_test.go             |  10 +-
 vendor/gopkg.in/yaml.v2/example_embedded_test.go   |  41 ++++
 vendor/gopkg.in/yaml.v2/scannerc.go                |   9 +-
 24 files changed, 714 insertions(+), 589 deletions(-)
 create mode 100755 vendor/gopkg.in/olivere/elastic.v5/run-es-5.5.1.sh
 create mode 100644 vendor/gopkg.in/yaml.v2/example_embedded_test.go

(limited to 'vendor/gopkg.in')

diff --git a/vendor/gopkg.in/gomail.v2/.travis.yml b/vendor/gopkg.in/gomail.v2/.travis.yml
index 48915e737..24edf22cc 100644
--- a/vendor/gopkg.in/gomail.v2/.travis.yml
+++ b/vendor/gopkg.in/gomail.v2/.travis.yml
@@ -5,5 +5,4 @@ go:
   - 1.3
   - 1.4
   - 1.5
-  - 1.6
   - tip
diff --git a/vendor/gopkg.in/gomail.v2/README.md b/vendor/gopkg.in/gomail.v2/README.md
index b3be9e146..18cb88130 100644
--- a/vendor/gopkg.in/gomail.v2/README.md
+++ b/vendor/gopkg.in/gomail.v2/README.md
@@ -6,12 +6,8 @@
 Gomail is a simple and efficient package to send emails. It is well tested and
 documented.
 
-Gomail can only send emails using an SMTP server. But the API is flexible and it
-is easy to implement other methods for sending emails using a local Postfix, an
-API, etc.
-
 It is versioned using [gopkg.in](https://gopkg.in) so I promise
-there will never be backward incompatible changes within each version.
+they will never be backward incompatible changes within each version.
 
 It requires Go 1.2 or newer. With Go 1.5, no external dependencies are used.
 
@@ -25,6 +21,7 @@ Gomail supports:
 - Automatic encoding of special characters
 - SSL and TLS
 - Sending multiple emails with the same SMTP connection
+- Any method to send emails: SMTP, postfix (not included but easily doable), etc
 
 
 ## Documentation
@@ -51,20 +48,8 @@ considered valid by the client running Gomail. As a quick workaround you can
 bypass the verification of the server's certificate chain and host name by using
 `SetTLSConfig`:
 
-    package main
-
-    import (
-    	"crypto/tls"
-
-    	"gopkg.in/gomail.v2"
-    )
-
-    func main() {
-    	d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")
-    	d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
-
-        // Send emails using d.
-    }
+    d := gomail.NewPlainDialer("smtp.example.com", "user", "123456", 587)
+    d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
 
 Note, however, that this is insecure and should not be used in production.
 
@@ -90,3 +75,23 @@ See [CHANGELOG.md](CHANGELOG.md).
 You can ask questions on the [Gomail
 thread](https://groups.google.com/d/topic/golang-nuts/jMxZHzvvEVg/discussion)
 in the Go mailing-list.
+
+
+## Support
+
+If you want to support the development of Gomail, I gladly accept donations.
+
+I will give 100% of the money I receive to
+[Enfants, Espoir Du Monde](http://www.eedm.fr/).
+EEDM is a French NGO which helps children in Bangladesh, Cameroun, Haiti, India
+and Madagascar.
+
+All its members are volunteers so its operating costs are only
+1.9%. So your money will directly helps children of these countries.
+
+As an added bonus, your donations will also tip me by lowering my taxes :smile:
+
+I will send an email with the receipt of the donation to EEDM annually to all
+donors.
+
+[![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=PYQKC7VFVXCFG)
diff --git a/vendor/gopkg.in/gomail.v2/auth.go b/vendor/gopkg.in/gomail.v2/auth.go
index d28b83ab7..4bcdd0620 100644
--- a/vendor/gopkg.in/gomail.v2/auth.go
+++ b/vendor/gopkg.in/gomail.v2/auth.go
@@ -7,33 +7,51 @@ import (
 	"net/smtp"
 )
 
-// loginAuth is an smtp.Auth that implements the LOGIN authentication mechanism.
-type loginAuth struct {
+// plainAuth is an smtp.Auth that implements the PLAIN authentication mechanism.
+// It fallbacks to the LOGIN mechanism if it is the only mechanism advertised
+// by the server.
+type plainAuth struct {
 	username string
 	password string
 	host     string
+	login    bool
 }
 
-func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
-	if !server.TLS {
-		advertised := false
-		for _, mechanism := range server.Auth {
-			if mechanism == "LOGIN" {
-				advertised = true
-				break
-			}
-		}
-		if !advertised {
-			return "", nil, errors.New("gomail: unencrypted connection")
-		}
-	}
+func (a *plainAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
 	if server.Name != a.host {
 		return "", nil, errors.New("gomail: wrong host name")
 	}
-	return "LOGIN", nil, nil
+
+	var plain, login bool
+	for _, a := range server.Auth {
+		switch a {
+		case "PLAIN":
+			plain = true
+		case "LOGIN":
+			login = true
+		}
+	}
+
+	if !server.TLS && !plain && !login {
+		return "", nil, errors.New("gomail: unencrypted connection")
+	}
+
+	if !plain && login {
+		a.login = true
+		return "LOGIN", nil, nil
+	}
+
+	return "PLAIN", []byte("\x00" + a.username + "\x00" + a.password), nil
 }
 
-func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+func (a *plainAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+	if !a.login {
+		if more {
+			return nil, errors.New("gomail: unexpected server challenge")
+		}
+		return nil, nil
+	}
+
 	if !more {
 		return nil, nil
 	}
diff --git a/vendor/gopkg.in/gomail.v2/auth_test.go b/vendor/gopkg.in/gomail.v2/auth_test.go
index 428ef3467..20b477214 100644
--- a/vendor/gopkg.in/gomail.v2/auth_test.go
+++ b/vendor/gopkg.in/gomail.v2/auth_test.go
@@ -11,51 +11,103 @@ const (
 	testHost = "smtp.example.com"
 )
 
-type authTest struct {
+var testAuth = &plainAuth{
+	username: testUser,
+	password: testPwd,
+	host:     testHost,
+}
+
+type plainAuthTest struct {
 	auths      []string
 	challenges []string
 	tls        bool
+	wantProto  string
 	wantData   []string
 	wantError  bool
 }
 
 func TestNoAdvertisement(t *testing.T) {
-	testLoginAuth(t, &authTest{
-		auths:     []string{},
-		tls:       false,
-		wantError: true,
+	testPlainAuth(t, &plainAuthTest{
+		auths:      []string{},
+		challenges: []string{"Username:", "Password:"},
+		tls:        false,
+		wantProto:  "PLAIN",
+		wantError:  true,
 	})
 }
 
 func TestNoAdvertisementTLS(t *testing.T) {
-	testLoginAuth(t, &authTest{
+	testPlainAuth(t, &plainAuthTest{
 		auths:      []string{},
 		challenges: []string{"Username:", "Password:"},
 		tls:        true,
-		wantData:   []string{"", testUser, testPwd},
+		wantProto:  "PLAIN",
+		wantData:   []string{"\x00" + testUser + "\x00" + testPwd},
 	})
 }
 
-func TestLogin(t *testing.T) {
-	testLoginAuth(t, &authTest{
+func TestPlain(t *testing.T) {
+	testPlainAuth(t, &plainAuthTest{
+		auths:      []string{"PLAIN"},
+		challenges: []string{"Username:", "Password:"},
+		tls:        false,
+		wantProto:  "PLAIN",
+		wantData:   []string{"\x00" + testUser + "\x00" + testPwd},
+	})
+}
+
+func TestPlainTLS(t *testing.T) {
+	testPlainAuth(t, &plainAuthTest{
+		auths:      []string{"PLAIN"},
+		challenges: []string{"Username:", "Password:"},
+		tls:        true,
+		wantProto:  "PLAIN",
+		wantData:   []string{"\x00" + testUser + "\x00" + testPwd},
+	})
+}
+
+func TestPlainAndLogin(t *testing.T) {
+	testPlainAuth(t, &plainAuthTest{
 		auths:      []string{"PLAIN", "LOGIN"},
 		challenges: []string{"Username:", "Password:"},
 		tls:        false,
+		wantProto:  "PLAIN",
+		wantData:   []string{"\x00" + testUser + "\x00" + testPwd},
+	})
+}
+
+func TestPlainAndLoginTLS(t *testing.T) {
+	testPlainAuth(t, &plainAuthTest{
+		auths:      []string{"PLAIN", "LOGIN"},
+		challenges: []string{"Username:", "Password:"},
+		tls:        true,
+		wantProto:  "PLAIN",
+		wantData:   []string{"\x00" + testUser + "\x00" + testPwd},
+	})
+}
+
+func TestLogin(t *testing.T) {
+	testPlainAuth(t, &plainAuthTest{
+		auths:      []string{"LOGIN"},
+		challenges: []string{"Username:", "Password:"},
+		tls:        false,
+		wantProto:  "LOGIN",
 		wantData:   []string{"", testUser, testPwd},
 	})
 }
 
 func TestLoginTLS(t *testing.T) {
-	testLoginAuth(t, &authTest{
+	testPlainAuth(t, &plainAuthTest{
 		auths:      []string{"LOGIN"},
 		challenges: []string{"Username:", "Password:"},
 		tls:        true,
+		wantProto:  "LOGIN",
 		wantData:   []string{"", testUser, testPwd},
 	})
 }
 
-func testLoginAuth(t *testing.T, test *authTest) {
-	auth := &loginAuth{
+func testPlainAuth(t *testing.T, test *plainAuthTest) {
+	auth := &plainAuth{
 		username: testUser,
 		password: testPwd,
 		host:     testHost,
@@ -67,13 +119,13 @@ func testLoginAuth(t *testing.T, test *authTest) {
 	}
 	proto, toServer, err := auth.Start(server)
 	if err != nil && !test.wantError {
-		t.Fatalf("loginAuth.Start(): %v", err)
+		t.Fatalf("plainAuth.Start(): %v", err)
 	}
 	if err != nil && test.wantError {
 		return
 	}
-	if proto != "LOGIN" {
-		t.Errorf("invalid protocol, got %q, want LOGIN", proto)
+	if proto != test.wantProto {
+		t.Errorf("invalid protocol, got %q, want %q", proto, test.wantProto)
 	}
 
 	i := 0
@@ -82,6 +134,10 @@ func testLoginAuth(t *testing.T, test *authTest) {
 		t.Errorf("Invalid response, got %q, want %q", got, test.wantData[i])
 	}
 
+	if proto == "PLAIN" {
+		return
+	}
+
 	for _, challenge := range test.challenges {
 		i++
 		if i >= len(test.wantData) {
@@ -90,7 +146,7 @@ func testLoginAuth(t *testing.T, test *authTest) {
 
 		toServer, err = auth.Next([]byte(challenge), true)
 		if err != nil {
-			t.Fatalf("loginAuth.Auth(): %v", err)
+			t.Fatalf("plainAuth.Auth(): %v", err)
 		}
 		got = string(toServer)
 		if got != test.wantData[i] {
diff --git a/vendor/gopkg.in/gomail.v2/example_test.go b/vendor/gopkg.in/gomail.v2/example_test.go
index 90008abe8..8d9c6c293 100644
--- a/vendor/gopkg.in/gomail.v2/example_test.go
+++ b/vendor/gopkg.in/gomail.v2/example_test.go
@@ -19,7 +19,7 @@ func Example() {
 	m.SetBody("text/html", "Hello <b>Bob</b> and <i>Cora</i>!")
 	m.Attach("/home/Alex/lolcat.jpg")
 
-	d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")
+	d := gomail.NewPlainDialer("smtp.example.com", 587, "user", "123456")
 
 	// Send the email to Bob, Cora and Dan.
 	if err := d.DialAndSend(m); err != nil {
@@ -32,7 +32,7 @@ func Example_daemon() {
 	ch := make(chan *gomail.Message)
 
 	go func() {
-		d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")
+		d := gomail.NewPlainDialer("smtp.example.com", 587, "user", "123456")
 
 		var s gomail.SendCloser
 		var err error
@@ -79,7 +79,7 @@ func Example_newsletter() {
 		Address string
 	}
 
-	d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")
+	d := gomail.NewPlainDialer("smtp.example.com", 587, "user", "123456")
 	s, err := d.Dial()
 	if err != nil {
 		panic(err)
@@ -151,10 +151,6 @@ func ExampleSetHeader() {
 	m.Attach("foo.jpg", gomail.SetHeader(h))
 }
 
-func ExampleRename() {
-	m.Attach("/tmp/0000146.jpg", gomail.Rename("picture.jpg"))
-}
-
 func ExampleMessage_AddAlternative() {
 	m.SetBody("text/plain", "Hello!")
 	m.AddAlternative("text/html", "<p>Hello!</p>")
@@ -217,7 +213,3 @@ func ExampleSetCharset() {
 func ExampleSetEncoding() {
 	m = gomail.NewMessage(gomail.SetEncoding(gomail.Base64))
 }
-
-func ExampleSetPartEncoding() {
-	m.SetBody("text/plain", "Hello!", gomail.SetPartEncoding(gomail.Unencoded))
-}
diff --git a/vendor/gopkg.in/gomail.v2/message.go b/vendor/gopkg.in/gomail.v2/message.go
index 4bffb1e7f..2f75368bd 100644
--- a/vendor/gopkg.in/gomail.v2/message.go
+++ b/vendor/gopkg.in/gomail.v2/message.go
@@ -11,7 +11,7 @@ import (
 // Message represents an email.
 type Message struct {
 	header      header
-	parts       []*part
+	parts       []part
 	attachments []*file
 	embedded    []*file
 	charset     string
@@ -23,9 +23,8 @@ type Message struct {
 type header map[string][]string
 
 type part struct {
-	contentType string
-	copier      func(io.Writer) error
-	encoding    Encoding
+	header header
+	copier func(io.Writer) error
 }
 
 // NewMessage creates a new message. It uses UTF-8 and quoted-printable encoding
@@ -127,10 +126,6 @@ func (m *Message) SetAddressHeader(field, address, name string) {
 
 // FormatAddress formats an address and a name as a valid RFC 5322 address.
 func (m *Message) FormatAddress(address, name string) string {
-	if name == "" {
-		return address
-	}
-
 	enc := m.encodeString(name)
 	if enc == name {
 		m.buf.WriteByte('"')
@@ -182,60 +177,53 @@ func (m *Message) GetHeader(field string) []string {
 	return m.header[field]
 }
 
-// SetBody sets the body of the message. It replaces any content previously set
-// by SetBody, AddAlternative or AddAlternativeWriter.
-func (m *Message) SetBody(contentType, body string, settings ...PartSetting) {
-	m.parts = []*part{m.newPart(contentType, newCopier(body), settings)}
+// SetBody sets the body of the message.
+func (m *Message) SetBody(contentType, body string) {
+	m.parts = []part{
+		{
+			header: m.getPartHeader(contentType),
+			copier: func(w io.Writer) error {
+				_, err := io.WriteString(w, body)
+				return err
+			},
+		},
+	}
 }
 
 // AddAlternative adds an alternative part to the message.
 //
 // It is commonly used to send HTML emails that default to the plain text
-// version for backward compatibility. AddAlternative appends the new part to
-// the end of the message. So the plain text part should be added before the
-// HTML part. See http://en.wikipedia.org/wiki/MIME#Alternative
-func (m *Message) AddAlternative(contentType, body string, settings ...PartSetting) {
-	m.AddAlternativeWriter(contentType, newCopier(body), settings...)
-}
-
-func newCopier(s string) func(io.Writer) error {
-	return func(w io.Writer) error {
-		_, err := io.WriteString(w, s)
-		return err
-	}
+// version for backward compatibility.
+//
+// More info: http://en.wikipedia.org/wiki/MIME#Alternative
+func (m *Message) AddAlternative(contentType, body string) {
+	m.parts = append(m.parts,
+		part{
+			header: m.getPartHeader(contentType),
+			copier: func(w io.Writer) error {
+				_, err := io.WriteString(w, body)
+				return err
+			},
+		},
+	)
 }
 
 // AddAlternativeWriter adds an alternative part to the message. It can be
 // useful with the text/template or html/template packages.
-func (m *Message) AddAlternativeWriter(contentType string, f func(io.Writer) error, settings ...PartSetting) {
-	m.parts = append(m.parts, m.newPart(contentType, f, settings))
-}
-
-func (m *Message) newPart(contentType string, f func(io.Writer) error, settings []PartSetting) *part {
-	p := &part{
-		contentType: contentType,
-		copier:      f,
-		encoding:    m.encoding,
-	}
-
-	for _, s := range settings {
-		s(p)
+func (m *Message) AddAlternativeWriter(contentType string, f func(io.Writer) error) {
+	m.parts = []part{
+		{
+			header: m.getPartHeader(contentType),
+			copier: f,
+		},
 	}
-
-	return p
 }
 
-// A PartSetting can be used as an argument in Message.SetBody,
-// Message.AddAlternative or Message.AddAlternativeWriter to configure the part
-// added to a message.
-type PartSetting func(*part)
-
-// SetPartEncoding sets the encoding of the part added to the message. By
-// default, parts use the same encoding than the message.
-func SetPartEncoding(e Encoding) PartSetting {
-	return PartSetting(func(p *part) {
-		p.encoding = e
-	})
+func (m *Message) getPartHeader(contentType string) header {
+	return map[string][]string{
+		"Content-Type":              {contentType + "; charset=" + m.charset},
+		"Content-Transfer-Encoding": {string(m.encoding)},
+	}
 }
 
 type file struct {
@@ -264,14 +252,6 @@ func SetHeader(h map[string][]string) FileSetting {
 	}
 }
 
-// Rename is a file setting to set the name of the attachment if the name is
-// different than the filename on disk.
-func Rename(name string) FileSetting {
-	return func(f *file) {
-		f.Name = name
-	}
-}
-
 // SetCopyFunc is a file setting to replace the function that runs when the
 // message is sent. It should copy the content of the file to the io.Writer.
 //
diff --git a/vendor/gopkg.in/gomail.v2/message_test.go b/vendor/gopkg.in/gomail.v2/message_test.go
index acceff2a6..fdd9ff9bd 100644
--- a/vendor/gopkg.in/gomail.v2/message_test.go
+++ b/vendor/gopkg.in/gomail.v2/message_test.go
@@ -63,6 +63,29 @@ func TestMessage(t *testing.T) {
 	testMessage(t, m, 0, want)
 }
 
+func TestBodyWriter(t *testing.T) {
+	m := NewMessage()
+	m.SetHeader("From", "from@example.com")
+	m.SetHeader("To", "to@example.com")
+	m.AddAlternativeWriter("text/plain", func(w io.Writer) error {
+		_, err := w.Write([]byte("Test message"))
+		return err
+	})
+
+	want := &message{
+		from: "from@example.com",
+		to:   []string{"to@example.com"},
+		content: "From: from@example.com\r\n" +
+			"To: to@example.com\r\n" +
+			"Content-Type: text/plain; charset=UTF-8\r\n" +
+			"Content-Transfer-Encoding: quoted-printable\r\n" +
+			"\r\n" +
+			"Test message",
+	}
+
+	testMessage(t, m, 0, want)
+}
+
 func TestCustomMessage(t *testing.T) {
 	m := NewMessage(SetCharset("ISO-8859-1"), SetEncoding(Base64))
 	m.SetHeaders(map[string][]string{
@@ -150,8 +173,7 @@ func TestAlternative(t *testing.T) {
 		to:   []string{"to@example.com"},
 		content: "From: from@example.com\r\n" +
 			"To: to@example.com\r\n" +
-			"Content-Type: multipart/alternative;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
+			"Content-Type: multipart/alternative; boundary=_BOUNDARY_1_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_1_\r\n" +
 			"Content-Type: text/plain; charset=UTF-8\r\n" +
@@ -169,74 +191,6 @@ func TestAlternative(t *testing.T) {
 	testMessage(t, m, 1, want)
 }
 
-func TestPartSetting(t *testing.T) {
-	m := NewMessage()
-	m.SetHeader("From", "from@example.com")
-	m.SetHeader("To", "to@example.com")
-	m.SetBody("text/plain; format=flowed", "¡Hola, señor!", SetPartEncoding(Unencoded))
-	m.AddAlternative("text/html", "¡<b>Hola</b>, <i>señor</i>!</h1>")
-
-	want := &message{
-		from: "from@example.com",
-		to:   []string{"to@example.com"},
-		content: "From: from@example.com\r\n" +
-			"To: to@example.com\r\n" +
-			"Content-Type: multipart/alternative;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
-			"\r\n" +
-			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: text/plain; format=flowed; charset=UTF-8\r\n" +
-			"Content-Transfer-Encoding: 8bit\r\n" +
-			"\r\n" +
-			"¡Hola, señor!\r\n" +
-			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: text/html; charset=UTF-8\r\n" +
-			"Content-Transfer-Encoding: quoted-printable\r\n" +
-			"\r\n" +
-			"=C2=A1<b>Hola</b>, <i>se=C3=B1or</i>!</h1>\r\n" +
-			"--_BOUNDARY_1_--\r\n",
-	}
-
-	testMessage(t, m, 1, want)
-}
-
-func TestBodyWriter(t *testing.T) {
-	m := NewMessage()
-	m.SetHeader("From", "from@example.com")
-	m.SetHeader("To", "to@example.com")
-	m.AddAlternativeWriter("text/plain", func(w io.Writer) error {
-		_, err := w.Write([]byte("Test message"))
-		return err
-	})
-	m.AddAlternativeWriter("text/html", func(w io.Writer) error {
-		_, err := w.Write([]byte("Test HTML"))
-		return err
-	})
-
-	want := &message{
-		from: "from@example.com",
-		to:   []string{"to@example.com"},
-		content: "From: from@example.com\r\n" +
-			"To: to@example.com\r\n" +
-			"Content-Type: multipart/alternative;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
-			"\r\n" +
-			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: text/plain; charset=UTF-8\r\n" +
-			"Content-Transfer-Encoding: quoted-printable\r\n" +
-			"\r\n" +
-			"Test message\r\n" +
-			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: text/html; charset=UTF-8\r\n" +
-			"Content-Transfer-Encoding: quoted-printable\r\n" +
-			"\r\n" +
-			"Test HTML\r\n" +
-			"--_BOUNDARY_1_--\r\n",
-	}
-
-	testMessage(t, m, 1, want)
-}
-
 func TestAttachmentOnly(t *testing.T) {
 	m := NewMessage()
 	m.SetHeader("From", "from@example.com")
@@ -270,8 +224,7 @@ func TestAttachment(t *testing.T) {
 		to:   []string{"to@example.com"},
 		content: "From: from@example.com\r\n" +
 			"To: to@example.com\r\n" +
-			"Content-Type: multipart/mixed;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
+			"Content-Type: multipart/mixed; boundary=_BOUNDARY_1_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_1_\r\n" +
 			"Content-Type: text/plain; charset=UTF-8\r\n" +
@@ -290,40 +243,6 @@ func TestAttachment(t *testing.T) {
 	testMessage(t, m, 1, want)
 }
 
-func TestRename(t *testing.T) {
-	m := NewMessage()
-	m.SetHeader("From", "from@example.com")
-	m.SetHeader("To", "to@example.com")
-	m.SetBody("text/plain", "Test")
-	name, copy := mockCopyFile("/tmp/test.pdf")
-	rename := Rename("another.pdf")
-	m.Attach(name, copy, rename)
-
-	want := &message{
-		from: "from@example.com",
-		to:   []string{"to@example.com"},
-		content: "From: from@example.com\r\n" +
-			"To: to@example.com\r\n" +
-			"Content-Type: multipart/mixed;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
-			"\r\n" +
-			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: text/plain; charset=UTF-8\r\n" +
-			"Content-Transfer-Encoding: quoted-printable\r\n" +
-			"\r\n" +
-			"Test\r\n" +
-			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: application/pdf; name=\"another.pdf\"\r\n" +
-			"Content-Disposition: attachment; filename=\"another.pdf\"\r\n" +
-			"Content-Transfer-Encoding: base64\r\n" +
-			"\r\n" +
-			base64.StdEncoding.EncodeToString([]byte("Content of test.pdf")) + "\r\n" +
-			"--_BOUNDARY_1_--\r\n",
-	}
-
-	testMessage(t, m, 1, want)
-}
-
 func TestAttachmentsOnly(t *testing.T) {
 	m := NewMessage()
 	m.SetHeader("From", "from@example.com")
@@ -336,8 +255,7 @@ func TestAttachmentsOnly(t *testing.T) {
 		to:   []string{"to@example.com"},
 		content: "From: from@example.com\r\n" +
 			"To: to@example.com\r\n" +
-			"Content-Type: multipart/mixed;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
+			"Content-Type: multipart/mixed; boundary=_BOUNDARY_1_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_1_\r\n" +
 			"Content-Type: application/pdf; name=\"test.pdf\"\r\n" +
@@ -370,8 +288,7 @@ func TestAttachments(t *testing.T) {
 		to:   []string{"to@example.com"},
 		content: "From: from@example.com\r\n" +
 			"To: to@example.com\r\n" +
-			"Content-Type: multipart/mixed;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
+			"Content-Type: multipart/mixed; boundary=_BOUNDARY_1_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_1_\r\n" +
 			"Content-Type: text/plain; charset=UTF-8\r\n" +
@@ -409,8 +326,7 @@ func TestEmbedded(t *testing.T) {
 		to:   []string{"to@example.com"},
 		content: "From: from@example.com\r\n" +
 			"To: to@example.com\r\n" +
-			"Content-Type: multipart/related;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
+			"Content-Type: multipart/related; boundary=_BOUNDARY_1_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_1_\r\n" +
 			"Content-Type: text/plain; charset=UTF-8\r\n" +
@@ -451,16 +367,13 @@ func TestFullMessage(t *testing.T) {
 		to:   []string{"to@example.com"},
 		content: "From: from@example.com\r\n" +
 			"To: to@example.com\r\n" +
-			"Content-Type: multipart/mixed;\r\n" +
-			" boundary=_BOUNDARY_1_\r\n" +
+			"Content-Type: multipart/mixed; boundary=_BOUNDARY_1_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_1_\r\n" +
-			"Content-Type: multipart/related;\r\n" +
-			" boundary=_BOUNDARY_2_\r\n" +
+			"Content-Type: multipart/related; boundary=_BOUNDARY_2_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_2_\r\n" +
-			"Content-Type: multipart/alternative;\r\n" +
-			" boundary=_BOUNDARY_3_\r\n" +
+			"Content-Type: multipart/alternative; boundary=_BOUNDARY_3_\r\n" +
 			"\r\n" +
 			"--_BOUNDARY_3_\r\n" +
 			"Content-Type: text/plain; charset=UTF-8\r\n" +
@@ -564,34 +477,6 @@ func TestBase64LineLength(t *testing.T) {
 	testMessage(t, m, 0, want)
 }
 
-func TestEmptyName(t *testing.T) {
-	m := NewMessage()
-	m.SetAddressHeader("From", "from@example.com", "")
-
-	want := &message{
-		from:    "from@example.com",
-		content: "From: from@example.com\r\n",
-	}
-
-	testMessage(t, m, 0, want)
-}
-
-func TestEmptyHeader(t *testing.T) {
-	m := NewMessage()
-	m.SetHeaders(map[string][]string{
-		"From":    {"from@example.com"},
-		"X-Empty": nil,
-	})
-
-	want := &message{
-		from: "from@example.com",
-		content: "From: from@example.com\r\n" +
-			"X-Empty:\r\n",
-	}
-
-	testMessage(t, m, 0, want)
-}
-
 func testMessage(t *testing.T, m *Message, bCount int, want *message) {
 	err := Send(stubSendMail(t, bCount, want), m)
 	if err != nil {
diff --git a/vendor/gopkg.in/gomail.v2/mime.go b/vendor/gopkg.in/gomail.v2/mime.go
index 194d4a769..51cba724b 100644
--- a/vendor/gopkg.in/gomail.v2/mime.go
+++ b/vendor/gopkg.in/gomail.v2/mime.go
@@ -5,7 +5,6 @@ package gomail
 import (
 	"mime"
 	"mime/quotedprintable"
-	"strings"
 )
 
 var newQPWriter = quotedprintable.NewWriter
@@ -15,7 +14,6 @@ type mimeEncoder struct {
 }
 
 var (
-	bEncoding     = mimeEncoder{mime.BEncoding}
-	qEncoding     = mimeEncoder{mime.QEncoding}
-	lastIndexByte = strings.LastIndexByte
+	bEncoding = mimeEncoder{mime.BEncoding}
+	qEncoding = mimeEncoder{mime.QEncoding}
 )
diff --git a/vendor/gopkg.in/gomail.v2/mime_go14.go b/vendor/gopkg.in/gomail.v2/mime_go14.go
index 3dc26aa2a..246e2e5e5 100644
--- a/vendor/gopkg.in/gomail.v2/mime_go14.go
+++ b/vendor/gopkg.in/gomail.v2/mime_go14.go
@@ -11,15 +11,6 @@ type mimeEncoder struct {
 }
 
 var (
-	bEncoding     = mimeEncoder{quotedprintable.BEncoding}
-	qEncoding     = mimeEncoder{quotedprintable.QEncoding}
-	lastIndexByte = func(s string, c byte) int {
-		for i := len(s) - 1; i >= 0; i-- {
-
-			if s[i] == c {
-				return i
-			}
-		}
-		return -1
-	}
+	bEncoding = mimeEncoder{quotedprintable.BEncoding}
+	qEncoding = mimeEncoder{quotedprintable.QEncoding}
 )
diff --git a/vendor/gopkg.in/gomail.v2/send.go b/vendor/gopkg.in/gomail.v2/send.go
index 9115ebe72..3e6726509 100644
--- a/vendor/gopkg.in/gomail.v2/send.go
+++ b/vendor/gopkg.in/gomail.v2/send.go
@@ -20,7 +20,7 @@ type SendCloser interface {
 	Close() error
 }
 
-// A SendFunc is a function that sends emails to the given addresses.
+// A SendFunc is a function that sends emails to the given adresses.
 //
 // The SendFunc type is an adapter to allow the use of ordinary functions as
 // email senders. If f is a function with the appropriate signature, SendFunc(f)
@@ -108,9 +108,10 @@ func addAddress(list []string, addr string) []string {
 }
 
 func parseAddress(field string) (string, error) {
-	addr, err := mail.ParseAddress(field)
-	if err != nil {
-		return "", fmt.Errorf("gomail: invalid address %q: %v", field, err)
+	a, err := mail.ParseAddress(field)
+	if a == nil {
+		return "", err
 	}
-	return addr.Address, nil
+
+	return a.Address, err
 }
diff --git a/vendor/gopkg.in/gomail.v2/smtp.go b/vendor/gopkg.in/gomail.v2/smtp.go
index 2aa49c8b6..cf773a102 100644
--- a/vendor/gopkg.in/gomail.v2/smtp.go
+++ b/vendor/gopkg.in/gomail.v2/smtp.go
@@ -6,8 +6,6 @@ import (
 	"io"
 	"net"
 	"net/smtp"
-	"strings"
-	"time"
 )
 
 // A Dialer is a dialer to an SMTP server.
@@ -16,10 +14,6 @@ type Dialer struct {
 	Host string
 	// Port represents the port of the SMTP server.
 	Port int
-	// Username is the username to use to authenticate to the SMTP server.
-	Username string
-	// Password is the password to use to authenticate to the SMTP server.
-	Password string
 	// Auth represents the authentication mechanism used to authenticate to the
 	// SMTP server.
 	Auth smtp.Auth
@@ -30,94 +24,83 @@ type Dialer struct {
 	// TSLConfig represents the TLS configuration used for the TLS (when the
 	// STARTTLS extension is used) or SSL connection.
 	TLSConfig *tls.Config
-	// LocalName is the hostname sent to the SMTP server with the HELO command.
-	// By default, "localhost" is sent.
-	LocalName string
 }
 
-// NewDialer returns a new SMTP Dialer. The given parameters are used to connect
-// to the SMTP server.
-func NewDialer(host string, port int, username, password string) *Dialer {
-	return &Dialer{
-		Host:     host,
-		Port:     port,
-		Username: username,
-		Password: password,
-		SSL:      port == 465,
-	}
-}
-
-// NewPlainDialer returns a new SMTP Dialer. The given parameters are used to
-// connect to the SMTP server.
+// NewPlainDialer returns a Dialer. The given parameters are used to connect to
+// the SMTP server via a PLAIN authentication mechanism.
 //
-// Deprecated: Use NewDialer instead.
+// It fallbacks to the LOGIN mechanism if it is the only mechanism advertised by
+// the server.
 func NewPlainDialer(host string, port int, username, password string) *Dialer {
-	return NewDialer(host, port, username, password)
+	return &Dialer{
+		Host: host,
+		Port: port,
+		Auth: &plainAuth{
+			username: username,
+			password: password,
+			host:     host,
+		},
+		SSL: port == 465,
+	}
 }
 
 // Dial dials and authenticates to an SMTP server. The returned SendCloser
 // should be closed when done using it.
 func (d *Dialer) Dial() (SendCloser, error) {
-	conn, err := netDialTimeout("tcp", addr(d.Host, d.Port), 10*time.Second)
+	c, err := d.dial()
 	if err != nil {
 		return nil, err
 	}
 
+	if d.Auth != nil {
+		if ok, _ := c.Extension("AUTH"); ok {
+			if err = c.Auth(d.Auth); err != nil {
+				c.Close()
+				return nil, err
+			}
+		}
+	}
+
+	return &smtpSender{c}, nil
+}
+
+func (d *Dialer) dial() (smtpClient, error) {
 	if d.SSL {
-		conn = tlsClient(conn, d.tlsConfig())
+		return d.sslDial()
 	}
+	return d.starttlsDial()
+}
 
-	c, err := smtpNewClient(conn, d.Host)
+func (d *Dialer) starttlsDial() (smtpClient, error) {
+	c, err := smtpDial(addr(d.Host, d.Port))
 	if err != nil {
 		return nil, err
 	}
 
-	if d.LocalName != "" {
-		if err := c.Hello(d.LocalName); err != nil {
+	if ok, _ := c.Extension("STARTTLS"); ok {
+		if err := c.StartTLS(d.tlsConfig()); err != nil {
+			c.Close()
 			return nil, err
 		}
 	}
 
-	if !d.SSL {
-		if ok, _ := c.Extension("STARTTLS"); ok {
-			if err := c.StartTLS(d.tlsConfig()); err != nil {
-				c.Close()
-				return nil, err
-			}
-		}
-	}
-
-	if d.Auth == nil && d.Username != "" {
-		if ok, auths := c.Extension("AUTH"); ok {
-			if strings.Contains(auths, "CRAM-MD5") {
-				d.Auth = smtp.CRAMMD5Auth(d.Username, d.Password)
-			} else if strings.Contains(auths, "LOGIN") &&
-				!strings.Contains(auths, "PLAIN") {
-				d.Auth = &loginAuth{
-					username: d.Username,
-					password: d.Password,
-					host:     d.Host,
-				}
-			} else {
-				d.Auth = smtp.PlainAuth("", d.Username, d.Password, d.Host)
-			}
-		}
-	}
+	return c, nil
+}
 
-	if d.Auth != nil {
-		if err = c.Auth(d.Auth); err != nil {
-			c.Close()
-			return nil, err
-		}
+func (d *Dialer) sslDial() (smtpClient, error) {
+	conn, err := tlsDial("tcp", addr(d.Host, d.Port), d.tlsConfig())
+	if err != nil {
+		return nil, err
 	}
 
-	return &smtpSender{c, d}, nil
+	return newClient(conn, d.Host)
 }
 
 func (d *Dialer) tlsConfig() *tls.Config {
 	if d.TLSConfig == nil {
 		return &tls.Config{ServerName: d.Host}
 	}
+
 	return d.TLSConfig
 }
 
@@ -139,21 +122,10 @@ func (d *Dialer) DialAndSend(m ...*Message) error {
 
 type smtpSender struct {
 	smtpClient
-	d *Dialer
 }
 
 func (c *smtpSender) Send(from string, to []string, msg io.WriterTo) error {
 	if err := c.Mail(from); err != nil {
-		if err == io.EOF {
-			// This is probably due to a timeout, so reconnect and try again.
-			sc, derr := c.d.Dial()
-			if derr == nil {
-				if s, ok := sc.(*smtpSender); ok {
-					*c = *s
-					return c.Send(from, to, msg)
-				}
-			}
-		}
 		return err
 	}
 
@@ -182,15 +154,16 @@ func (c *smtpSender) Close() error {
 
 // Stubbed out for tests.
 var (
-	netDialTimeout = net.DialTimeout
-	tlsClient      = tls.Client
-	smtpNewClient  = func(conn net.Conn, host string) (smtpClient, error) {
+	smtpDial = func(addr string) (smtpClient, error) {
+		return smtp.Dial(addr)
+	}
+	tlsDial   = tls.Dial
+	newClient = func(conn net.Conn, host string) (smtpClient, error) {
 		return smtp.NewClient(conn, host)
 	}
 )
 
 type smtpClient interface {
-	Hello(string) error
 	Extension(string) (bool, string)
 	StartTLS(*tls.Config) error
 	Auth(smtp.Auth) error
diff --git a/vendor/gopkg.in/gomail.v2/smtp_test.go b/vendor/gopkg.in/gomail.v2/smtp_test.go
index b6f91555b..c8503489b 100644
--- a/vendor/gopkg.in/gomail.v2/smtp_test.go
+++ b/vendor/gopkg.in/gomail.v2/smtp_test.go
@@ -8,7 +8,6 @@ import (
 	"net/smtp"
 	"reflect"
 	"testing"
-	"time"
 )
 
 const (
@@ -17,14 +16,12 @@ const (
 )
 
 var (
-	testConn    = &net.TCPConn{}
 	testTLSConn = &tls.Conn{}
 	testConfig  = &tls.Config{InsecureSkipVerify: true}
-	testAuth    = smtp.PlainAuth("", testUser, testPwd, testHost)
 )
 
 func TestDialer(t *testing.T) {
-	d := NewDialer(testHost, testPort, "user", "pwd")
+	d := NewPlainDialer(testHost, testPort, "user", "pwd")
 	testSendMail(t, d, []string{
 		"Extension STARTTLS",
 		"StartTLS",
@@ -42,7 +39,7 @@ func TestDialer(t *testing.T) {
 }
 
 func TestDialerSSL(t *testing.T) {
-	d := NewDialer(testHost, testSSLPort, "user", "pwd")
+	d := NewPlainDialer(testHost, testSSLPort, "user", "pwd")
 	testSendMail(t, d, []string{
 		"Extension AUTH",
 		"Auth",
@@ -58,11 +55,9 @@ func TestDialerSSL(t *testing.T) {
 }
 
 func TestDialerConfig(t *testing.T) {
-	d := NewDialer(testHost, testPort, "user", "pwd")
-	d.LocalName = "test"
+	d := NewPlainDialer(testHost, testPort, "user", "pwd")
 	d.TLSConfig = testConfig
 	testSendMail(t, d, []string{
-		"Hello test",
 		"Extension STARTTLS",
 		"StartTLS",
 		"Extension AUTH",
@@ -79,11 +74,9 @@ func TestDialerConfig(t *testing.T) {
 }
 
 func TestDialerSSLConfig(t *testing.T) {
-	d := NewDialer(testHost, testSSLPort, "user", "pwd")
-	d.LocalName = "test"
+	d := NewPlainDialer(testHost, testSSLPort, "user", "pwd")
 	d.TLSConfig = testConfig
 	testSendMail(t, d, []string{
-		"Hello test",
 		"Extension AUTH",
 		"Auth",
 		"Mail " + testFrom,
@@ -116,40 +109,13 @@ func TestDialerNoAuth(t *testing.T) {
 	})
 }
 
-func TestDialerTimeout(t *testing.T) {
-	d := &Dialer{
-		Host: testHost,
-		Port: testPort,
-	}
-	testSendMailTimeout(t, d, []string{
-		"Extension STARTTLS",
-		"StartTLS",
-		"Mail " + testFrom,
-		"Extension STARTTLS",
-		"StartTLS",
-		"Mail " + testFrom,
-		"Rcpt " + testTo1,
-		"Rcpt " + testTo2,
-		"Data",
-		"Write message",
-		"Close writer",
-		"Quit",
-		"Close",
-	})
-}
-
 type mockClient struct {
-	t       *testing.T
-	i       int
-	want    []string
-	addr    string
-	config  *tls.Config
-	timeout bool
-}
-
-func (c *mockClient) Hello(localName string) error {
-	c.do("Hello " + localName)
-	return nil
+	t      *testing.T
+	i      int
+	want   []string
+	addr   string
+	auth   smtp.Auth
+	config *tls.Config
 }
 
 func (c *mockClient) Extension(ext string) (bool, string) {
@@ -164,19 +130,13 @@ func (c *mockClient) StartTLS(config *tls.Config) error {
 }
 
 func (c *mockClient) Auth(a smtp.Auth) error {
-	if !reflect.DeepEqual(a, testAuth) {
-		c.t.Errorf("Invalid auth, got %#v, want %#v", a, testAuth)
-	}
+	assertAuth(c.t, a, c.auth)
 	c.do("Auth")
 	return nil
 }
 
 func (c *mockClient) Mail(from string) error {
 	c.do("Mail " + from)
-	if c.timeout {
-		c.timeout = false
-		return io.EOF
-	}
 	return nil
 }
 
@@ -232,42 +192,32 @@ func (w *mockWriter) Close() error {
 }
 
 func testSendMail(t *testing.T, d *Dialer, want []string) {
-	doTestSendMail(t, d, want, false)
-}
-
-func testSendMailTimeout(t *testing.T, d *Dialer, want []string) {
-	doTestSendMail(t, d, want, true)
-}
-
-func doTestSendMail(t *testing.T, d *Dialer, want []string, timeout bool) {
 	testClient := &mockClient{
-		t:       t,
-		want:    want,
-		addr:    addr(d.Host, d.Port),
-		config:  d.TLSConfig,
-		timeout: timeout,
+		t:      t,
+		want:   want,
+		addr:   addr(d.Host, d.Port),
+		auth:   testAuth,
+		config: d.TLSConfig,
 	}
 
-	netDialTimeout = func(network, address string, d time.Duration) (net.Conn, error) {
-		if network != "tcp" {
-			t.Errorf("Invalid network, got %q, want tcp", network)
-		}
-		if address != testClient.addr {
-			t.Errorf("Invalid address, got %q, want %q",
-				address, testClient.addr)
-		}
-		return testConn, nil
+	smtpDial = func(addr string) (smtpClient, error) {
+		assertAddr(t, addr, testClient.addr)
+		return testClient, nil
 	}
 
-	tlsClient = func(conn net.Conn, config *tls.Config) *tls.Conn {
-		if conn != testConn {
-			t.Errorf("Invalid conn, got %#v, want %#v", conn, testConn)
+	tlsDial = func(network, addr string, config *tls.Config) (*tls.Conn, error) {
+		if network != "tcp" {
+			t.Errorf("Invalid network, got %q, want tcp", network)
 		}
+		assertAddr(t, addr, testClient.addr)
 		assertConfig(t, config, testClient.config)
-		return testTLSConn
+		return testTLSConn, nil
 	}
 
-	smtpNewClient = func(conn net.Conn, host string) (smtpClient, error) {
+	newClient = func(conn net.Conn, host string) (smtpClient, error) {
+		if conn != testTLSConn {
+			t.Error("Invalid TLS connection used")
+		}
 		if host != testHost {
 			t.Errorf("Invalid host, got %q, want %q", host, testHost)
 		}
@@ -279,6 +229,18 @@ func doTestSendMail(t *testing.T, d *Dialer, want []string, timeout bool) {
 	}
 }
 
+func assertAuth(t *testing.T, got, want smtp.Auth) {
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("Invalid auth, got %#v, want %#v", got, want)
+	}
+}
+
+func assertAddr(t *testing.T, got, want string) {
+	if got != want {
+		t.Errorf("Invalid addr, got %q, want %q", got, want)
+	}
+}
+
 func assertConfig(t *testing.T, got, want *tls.Config) {
 	if want == nil {
 		want = &tls.Config{ServerName: testHost}
diff --git a/vendor/gopkg.in/gomail.v2/writeto.go b/vendor/gopkg.in/gomail.v2/writeto.go
index 9fb6b86e8..57a1dd7f1 100644
--- a/vendor/gopkg.in/gomail.v2/writeto.go
+++ b/vendor/gopkg.in/gomail.v2/writeto.go
@@ -7,7 +7,6 @@ import (
 	"mime"
 	"mime/multipart"
 	"path/filepath"
-	"strings"
 	"time"
 )
 
@@ -39,7 +38,8 @@ func (w *messageWriter) writeMessage(m *Message) {
 		w.openMultipart("alternative")
 	}
 	for _, part := range m.parts {
-		w.writePart(part, m.charset)
+		w.writeHeaders(part.header)
+		w.writeBody(part.copier, m.encoding)
 	}
 	if m.hasAlternativePart() {
 		w.closeMultipart()
@@ -79,7 +79,7 @@ type messageWriter struct {
 
 func (w *messageWriter) openMultipart(mimeType string) {
 	mw := multipart.NewWriter(w)
-	contentType := "multipart/" + mimeType + ";\r\n boundary=" + mw.Boundary()
+	contentType := "multipart/" + mimeType + "; boundary=" + mw.Boundary()
 	w.writers[w.depth] = mw
 
 	if w.depth == 0 {
@@ -104,14 +104,6 @@ func (w *messageWriter) closeMultipart() {
 	}
 }
 
-func (w *messageWriter) writePart(p *part, charset string) {
-	w.writeHeaders(map[string][]string{
-		"Content-Type":              {p.contentType + "; charset=" + charset},
-		"Content-Transfer-Encoding": {string(p.encoding)},
-	})
-	w.writeBody(p.copier, p.encoding)
-}
-
 func (w *messageWriter) addFiles(files []*file, isAttachment bool) {
 	for _, f := range files {
 		if _, ok := f.Header["Content-Type"]; !ok {
@@ -162,80 +154,24 @@ func (w *messageWriter) writeString(s string) {
 	w.n += int64(n)
 }
 
-func (w *messageWriter) writeHeader(k string, v ...string) {
-	w.writeString(k)
-	if len(v) == 0 {
-		w.writeString(":\r\n")
-		return
-	}
-	w.writeString(": ")
-
-	// Max header line length is 78 characters in RFC 5322 and 76 characters
-	// in RFC 2047. So for the sake of simplicity we use the 76 characters
-	// limit.
-	charsLeft := 76 - len(k) - len(": ")
-
-	for i, s := range v {
-		// If the line is already too long, insert a newline right away.
-		if charsLeft < 1 {
-			if i == 0 {
-				w.writeString("\r\n ")
-			} else {
-				w.writeString(",\r\n ")
-			}
-			charsLeft = 75
-		} else if i != 0 {
-			w.writeString(", ")
-			charsLeft -= 2
-		}
-
-		// While the header content is too long, fold it by inserting a newline.
-		for len(s) > charsLeft {
-			s = w.writeLine(s, charsLeft)
-			charsLeft = 75
+func (w *messageWriter) writeStrings(a []string, sep string) {
+	if len(a) > 0 {
+		w.writeString(a[0])
+		if len(a) == 1 {
+			return
 		}
+	}
+	for _, s := range a[1:] {
+		w.writeString(sep)
 		w.writeString(s)
-		if i := lastIndexByte(s, '\n'); i != -1 {
-			charsLeft = 75 - (len(s) - i - 1)
-		} else {
-			charsLeft -= len(s)
-		}
 	}
-	w.writeString("\r\n")
 }
 
-func (w *messageWriter) writeLine(s string, charsLeft int) string {
-	// If there is already a newline before the limit. Write the line.
-	if i := strings.IndexByte(s, '\n'); i != -1 && i < charsLeft {
-		w.writeString(s[:i+1])
-		return s[i+1:]
-	}
-
-	for i := charsLeft - 1; i >= 0; i-- {
-		if s[i] == ' ' {
-			w.writeString(s[:i])
-			w.writeString("\r\n ")
-			return s[i+1:]
-		}
-	}
-
-	// We could not insert a newline cleanly so look for a space or a newline
-	// even if it is after the limit.
-	for i := 75; i < len(s); i++ {
-		if s[i] == ' ' {
-			w.writeString(s[:i])
-			w.writeString("\r\n ")
-			return s[i+1:]
-		}
-		if s[i] == '\n' {
-			w.writeString(s[:i+1])
-			return s[i+1:]
-		}
-	}
-
-	// Too bad, no space or newline in the whole string. Just write everything.
-	w.writeString(s)
-	return ""
+func (w *messageWriter) writeHeader(k string, v ...string) {
+	w.writeString(k)
+	w.writeString(": ")
+	w.writeStrings(v, ", ")
+	w.writeString("\r\n")
 }
 
 func (w *messageWriter) writeHeaders(h map[string][]string) {
diff --git a/vendor/gopkg.in/olivere/elastic.v5/client.go b/vendor/gopkg.in/olivere/elastic.v5/client.go
index 13be369bd..e517a7fa8 100644
--- a/vendor/gopkg.in/olivere/elastic.v5/client.go
+++ b/vendor/gopkg.in/olivere/elastic.v5/client.go
@@ -26,7 +26,7 @@ import (
 
 const (
 	// Version is the current version of Elastic.
-	Version = "5.0.43"
+	Version = "5.0.45"
 
 	// DefaultURL is the default endpoint of Elasticsearch on the local machine.
 	// It is used e.g. when initializing a new Client without a specific URL.
@@ -1257,6 +1257,13 @@ func (c *Client) PerformRequest(ctx context.Context, method, path string, params
 			// Proceed, but don't mark the node as dead
 			return nil, err
 		}
+		if ue, ok := err.(*url.Error); ok {
+			// This happens e.g. on redirect errors, see https://golang.org/src/net/http/client_test.go#L329
+			if ue.Err == context.Canceled || ue.Err == context.DeadlineExceeded {
+				// Proceed, but don't mark the node as dead
+				return nil, err
+			}
+		}
 		if err != nil {
 			n++
 			wait, ok, rerr := c.retrier.Retry(ctx, n, (*http.Request)(req), res, err)
diff --git a/vendor/gopkg.in/olivere/elastic.v5/client_test.go b/vendor/gopkg.in/olivere/elastic.v5/client_test.go
index 1441f1791..6caf7b797 100644
--- a/vendor/gopkg.in/olivere/elastic.v5/client_test.go
+++ b/vendor/gopkg.in/olivere/elastic.v5/client_test.go
@@ -16,6 +16,7 @@ import (
 	"reflect"
 	"regexp"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 
@@ -294,6 +295,7 @@ func TestClientHealthcheckTimeoutLeak(t *testing.T) {
 	// leaks via leaktest.
 	mux := http.NewServeMux()
 
+	var reqDoneMu sync.Mutex
 	var reqDone bool
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		cn, ok := w.(http.CloseNotifier)
@@ -301,7 +303,9 @@ func TestClientHealthcheckTimeoutLeak(t *testing.T) {
 			t.Fatalf("Writer is not CloseNotifier, but %v", reflect.TypeOf(w).Name())
 		}
 		<-cn.CloseNotify()
+		reqDoneMu.Lock()
 		reqDone = true
+		reqDoneMu.Unlock()
 	})
 
 	lis, err := net.Listen("tcp", "127.0.0.1:0")
@@ -346,9 +350,12 @@ func TestClientHealthcheckTimeoutLeak(t *testing.T) {
 	}
 
 	<-time.After(time.Second)
+	reqDoneMu.Lock()
 	if !reqDone {
+		reqDoneMu.Unlock()
 		t.Fatal("Request wasn't canceled or stopped")
 	}
+	reqDoneMu.Unlock()
 }
 
 // -- NewSimpleClient --
@@ -552,6 +559,7 @@ func TestClientSniffTimeoutLeak(t *testing.T) {
 	// leaks via leaktest.
 	mux := http.NewServeMux()
 
+	var reqDoneMu sync.Mutex
 	var reqDone bool
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		cn, ok := w.(http.CloseNotifier)
@@ -559,7 +567,9 @@ func TestClientSniffTimeoutLeak(t *testing.T) {
 			t.Fatalf("Writer is not CloseNotifier, but %v", reflect.TypeOf(w).Name())
 		}
 		<-cn.CloseNotify()
+		reqDoneMu.Lock()
 		reqDone = true
+		reqDoneMu.Unlock()
 	})
 
 	lis, err := net.Listen("tcp", "127.0.0.1:0")
@@ -605,9 +615,12 @@ func TestClientSniffTimeoutLeak(t *testing.T) {
 	}
 
 	<-time.After(time.Second)
+	reqDoneMu.Lock()
 	if !reqDone {
+		reqDoneMu.Unlock()
 		t.Fatal("Request wasn't canceled or stopped")
 	}
+	reqDoneMu.Unlock()
 }
 
 func TestClientExtractHostname(t *testing.T) {
@@ -1195,7 +1208,8 @@ func TestPerformRequestWithTimeout(t *testing.T) {
 		res *Response
 		err error
 	}
-	ctx, _ := context.WithTimeout(context.Background(), 1*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+	defer cancel()
 
 	resc := make(chan result, 1)
 	go func() {
diff --git a/vendor/gopkg.in/olivere/elastic.v5/retry_test.go b/vendor/gopkg.in/olivere/elastic.v5/retry_test.go
index 14ebbb835..804313095 100644
--- a/vendor/gopkg.in/olivere/elastic.v5/retry_test.go
+++ b/vendor/gopkg.in/olivere/elastic.v5/retry_test.go
@@ -21,14 +21,14 @@ func TestRetry(t *testing.T) {
 	// This function is successfull on "successOn" calls.
 	f := func() error {
 		i++
-		t.Logf("function is called %d. time\n", i)
+		// t.Logf("function is called %d. time\n", i)
 
 		if i == successOn {
-			t.Log("OK")
+			// t.Log("OK")
 			return nil
 		}
 
-		t.Log("error")
+		// t.Log("error")
 		return errors.New("error")
 	}
 
diff --git a/vendor/gopkg.in/olivere/elastic.v5/run-es-5.5.1.sh b/vendor/gopkg.in/olivere/elastic.v5/run-es-5.5.1.sh
new file mode 100755
index 000000000..343a605ba
--- /dev/null
+++ b/vendor/gopkg.in/olivere/elastic.v5/run-es-5.5.1.sh
@@ -0,0 +1 @@
+docker run --rm --privileged=true -p 9200:9200 -p 9300:9300 -v "$PWD/etc:/usr/share/elasticsearch/config" -e ES_JAVA_OPTS='-Xms1g -Xmx1g' elasticsearch:5.5.1 elasticsearch
diff --git a/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms.go b/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms.go
index 5497aa6e9..6bcc322d0 100644
--- a/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms.go
+++ b/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms.go
@@ -20,15 +20,10 @@ type TermsAggregation struct {
 	minDocCount           *int
 	shardMinDocCount      *int
 	valueType             string
-	includePattern        string
-	includeFlags          *int
-	excludePattern        string
-	excludeFlags          *int
+	includeExclude        *TermsAggregationIncludeExclude
 	executionHint         string
 	collectionMode        string
 	showTermDocCountError *bool
-	includeTerms          []string
-	excludeTerms          []string
 	order                 []TermsOrder
 }
 
@@ -91,24 +86,50 @@ func (a *TermsAggregation) ShardMinDocCount(shardMinDocCount int) *TermsAggregat
 }
 
 func (a *TermsAggregation) Include(regexp string) *TermsAggregation {
-	a.includePattern = regexp
+	if a.includeExclude == nil {
+		a.includeExclude = &TermsAggregationIncludeExclude{}
+	}
+	a.includeExclude.Include = regexp
 	return a
 }
 
-func (a *TermsAggregation) IncludeWithFlags(regexp string, flags int) *TermsAggregation {
-	a.includePattern = regexp
-	a.includeFlags = &flags
+func (a *TermsAggregation) IncludeValues(values ...interface{}) *TermsAggregation {
+	if a.includeExclude == nil {
+		a.includeExclude = &TermsAggregationIncludeExclude{}
+	}
+	a.includeExclude.IncludeValues = append(a.includeExclude.IncludeValues, values...)
 	return a
 }
 
 func (a *TermsAggregation) Exclude(regexp string) *TermsAggregation {
-	a.excludePattern = regexp
+	if a.includeExclude == nil {
+		a.includeExclude = &TermsAggregationIncludeExclude{}
+	}
+	a.includeExclude.Exclude = regexp
+	return a
+}
+
+func (a *TermsAggregation) ExcludeValues(values ...interface{}) *TermsAggregation {
+	if a.includeExclude == nil {
+		a.includeExclude = &TermsAggregationIncludeExclude{}
+	}
+	a.includeExclude.ExcludeValues = append(a.includeExclude.ExcludeValues, values...)
+	return a
+}
+
+func (a *TermsAggregation) Partition(p int) *TermsAggregation {
+	if a.includeExclude == nil {
+		a.includeExclude = &TermsAggregationIncludeExclude{}
+	}
+	a.includeExclude.Partition = p
 	return a
 }
 
-func (a *TermsAggregation) ExcludeWithFlags(regexp string, flags int) *TermsAggregation {
-	a.excludePattern = regexp
-	a.excludeFlags = &flags
+func (a *TermsAggregation) NumPartitions(n int) *TermsAggregation {
+	if a.includeExclude == nil {
+		a.includeExclude = &TermsAggregationIncludeExclude{}
+	}
+	a.includeExclude.NumPartitions = n
 	return a
 }
 
@@ -207,16 +228,6 @@ func (a *TermsAggregation) ShowTermDocCountError(showTermDocCountError bool) *Te
 	return a
 }
 
-func (a *TermsAggregation) IncludeTerms(terms ...string) *TermsAggregation {
-	a.includeTerms = append(a.includeTerms, terms...)
-	return a
-}
-
-func (a *TermsAggregation) ExcludeTerms(terms ...string) *TermsAggregation {
-	a.excludeTerms = append(a.excludeTerms, terms...)
-	return a
-}
-
 func (a *TermsAggregation) Source() (interface{}, error) {
 	// Example:
 	//	{
@@ -283,32 +294,27 @@ func (a *TermsAggregation) Source() (interface{}, error) {
 		}
 		opts["order"] = orderSlice
 	}
-	if len(a.includeTerms) > 0 {
-		opts["include"] = a.includeTerms
-	}
-	if a.includePattern != "" {
-		if a.includeFlags == nil || *a.includeFlags == 0 {
-			opts["include"] = a.includePattern
-		} else {
-			p := make(map[string]interface{})
-			p["pattern"] = a.includePattern
-			p["flags"] = *a.includeFlags
-			opts["include"] = p
+	// Include/Exclude
+	if ie := a.includeExclude; ie != nil {
+		// Include
+		if ie.Include != "" {
+			opts["include"] = ie.Include
+		} else if len(ie.IncludeValues) > 0 {
+			opts["include"] = ie.IncludeValues
+		} else if ie.NumPartitions > 0 {
+			inc := make(map[string]interface{})
+			inc["partition"] = ie.Partition
+			inc["num_partitions"] = ie.NumPartitions
+			opts["include"] = inc
 		}
-	}
-	if len(a.excludeTerms) > 0 {
-		opts["exclude"] = a.excludeTerms
-	}
-	if a.excludePattern != "" {
-		if a.excludeFlags == nil || *a.excludeFlags == 0 {
-			opts["exclude"] = a.excludePattern
-		} else {
-			p := make(map[string]interface{})
-			p["pattern"] = a.excludePattern
-			p["flags"] = *a.excludeFlags
-			opts["exclude"] = p
+		// Exclude
+		if ie.Exclude != "" {
+			opts["exclude"] = ie.Exclude
+		} else if len(ie.ExcludeValues) > 0 {
+			opts["exclude"] = ie.ExcludeValues
 		}
 	}
+
 	if a.executionHint != "" {
 		opts["execution_hint"] = a.executionHint
 	}
@@ -334,6 +340,16 @@ func (a *TermsAggregation) Source() (interface{}, error) {
 	return source, nil
 }
 
+// TermsAggregationIncludeExclude allows for include/exclude in a TermsAggregation.
+type TermsAggregationIncludeExclude struct {
+	Include       string
+	Exclude       string
+	IncludeValues []interface{}
+	ExcludeValues []interface{}
+	Partition     int
+	NumPartitions int
+}
+
 // TermsOrder specifies a single order field for a terms aggregation.
 type TermsOrder struct {
 	Field     string
diff --git a/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms_test.go b/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms_test.go
index 6b5c1bb8a..351cbf63b 100644
--- a/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms_test.go
+++ b/vendor/gopkg.in/olivere/elastic.v5/search_aggs_bucket_terms_test.go
@@ -102,3 +102,54 @@ func TestTermsAggregationWithMissing(t *testing.T) {
 		t.Errorf("expected\n%s\n,got:\n%s", expected, got)
 	}
 }
+
+func TestTermsAggregationWithIncludeExclude(t *testing.T) {
+	agg := NewTermsAggregation().Field("tags").Include(".*sport.*").Exclude("water_.*")
+	src, err := agg.Source()
+	if err != nil {
+		t.Fatal(err)
+	}
+	data, err := json.Marshal(src)
+	if err != nil {
+		t.Fatalf("marshaling to JSON failed: %v", err)
+	}
+	got := string(data)
+	expected := `{"terms":{"exclude":"water_.*","field":"tags","include":".*sport.*"}}`
+	if got != expected {
+		t.Errorf("expected\n%s\n,got:\n%s", expected, got)
+	}
+}
+
+func TestTermsAggregationWithIncludeExcludeValues(t *testing.T) {
+	agg := NewTermsAggregation().Field("make").IncludeValues("mazda", "honda").ExcludeValues("rover", "jensen")
+	src, err := agg.Source()
+	if err != nil {
+		t.Fatal(err)
+	}
+	data, err := json.Marshal(src)
+	if err != nil {
+		t.Fatalf("marshaling to JSON failed: %v", err)
+	}
+	got := string(data)
+	expected := `{"terms":{"exclude":["rover","jensen"],"field":"make","include":["mazda","honda"]}}`
+	if got != expected {
+		t.Errorf("expected\n%s\n,got:\n%s", expected, got)
+	}
+}
+
+func TestTermsAggregationWithPartitions(t *testing.T) {
+	agg := NewTermsAggregation().Field("account_id").Partition(0).NumPartitions(20)
+	src, err := agg.Source()
+	if err != nil {
+		t.Fatal(err)
+	}
+	data, err := json.Marshal(src)
+	if err != nil {
+		t.Fatalf("marshaling to JSON failed: %v", err)
+	}
+	got := string(data)
+	expected := `{"terms":{"field":"account_id","include":{"num_partitions":20,"partition":0}}}`
+	if got != expected {
+		t.Errorf("expected\n%s\n,got:\n%s", expected, got)
+	}
+}
diff --git a/vendor/gopkg.in/yaml.v2/LICENSE b/vendor/gopkg.in/yaml.v2/LICENSE
index 866d74a7a..8dada3eda 100644
--- a/vendor/gopkg.in/yaml.v2/LICENSE
+++ b/vendor/gopkg.in/yaml.v2/LICENSE
@@ -1,13 +1,201 @@
-Copyright 2011-2016 Canonical Ltd.
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
-    http://www.apache.org/licenses/LICENSE-2.0
+   1. Definitions.
 
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
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diff --git a/vendor/gopkg.in/yaml.v2/README.md b/vendor/gopkg.in/yaml.v2/README.md
index 1884de6a7..7a512d67c 100644
--- a/vendor/gopkg.in/yaml.v2/README.md
+++ b/vendor/gopkg.in/yaml.v2/README.md
@@ -48,6 +48,8 @@ The yaml package is licensed under the Apache License 2.0. Please see the LICENS
 Example
 -------
 
+Some more examples can be found in the "examples" folder.
+
 ```Go
 package main
 
diff --git a/vendor/gopkg.in/yaml.v2/decode_test.go b/vendor/gopkg.in/yaml.v2/decode_test.go
index 3d0807a07..713b1ee9c 100644
--- a/vendor/gopkg.in/yaml.v2/decode_test.go
+++ b/vendor/gopkg.in/yaml.v2/decode_test.go
@@ -405,6 +405,12 @@ var unmarshalTests = []struct {
 		map[string]interface{}{"v": 1},
 	},
 
+	// Non-specific tag (Issue #75)
+	{
+		"v: ! test",
+		map[string]interface{}{"v": "test"},
+	},
+
 	// Anchors and aliases.
 	{
 		"a: &x 1\nb: &y 2\nc: *x\nd: *y\n",
@@ -604,7 +610,8 @@ type inlineC struct {
 }
 
 func (s *S) TestUnmarshal(c *C) {
-	for _, item := range unmarshalTests {
+	for i, item := range unmarshalTests {
+		c.Logf("test %d: %q", i, item.data)
 		t := reflect.ValueOf(item.value).Type()
 		var value interface{}
 		switch t.Kind() {
@@ -648,6 +655,7 @@ var unmarshalErrorTests = []struct {
 	{"a: !!binary ==", "yaml: !!binary value contains invalid base64 data"},
 	{"{[.]}", `yaml: invalid map key: \[\]interface \{\}\{"\."\}`},
 	{"{{.}}", `yaml: invalid map key: map\[interface\ \{\}\]interface \{\}\{".":interface \{\}\(nil\)\}`},
+	{"%TAG !%79! tag:yaml.org,2002:\n---\nv: !%79!int '1'", "yaml: did not find expected whitespace"},
 }
 
 func (s *S) TestUnmarshalErrors(c *C) {
diff --git a/vendor/gopkg.in/yaml.v2/example_embedded_test.go b/vendor/gopkg.in/yaml.v2/example_embedded_test.go
new file mode 100644
index 000000000..c8b241d54
--- /dev/null
+++ b/vendor/gopkg.in/yaml.v2/example_embedded_test.go
@@ -0,0 +1,41 @@
+package yaml_test
+
+import (
+	"fmt"
+	"log"
+
+        "gopkg.in/yaml.v2"
+)
+
+// An example showing how to unmarshal embedded
+// structs from YAML.
+
+type StructA struct {
+	A string `yaml:"a"`
+}
+
+type StructB struct {
+	// Embedded structs are not treated as embedded in YAML by default. To do that,
+	// add the ",inline" annotation below
+	StructA   `yaml:",inline"`
+	B string `yaml:"b"`
+}
+
+var data = `
+a: a string from struct A
+b: a string from struct B
+`
+
+func ExampleUnmarshal_embedded() {
+	var b StructB
+
+	err := yaml.Unmarshal([]byte(data), &b)
+	if err != nil {
+		log.Fatal("cannot unmarshal data: %v", err)
+	}
+        fmt.Println(b.A)
+        fmt.Println(b.B)
+        // Output:
+        // a string from struct A
+        // a string from struct B
+}
diff --git a/vendor/gopkg.in/yaml.v2/scannerc.go b/vendor/gopkg.in/yaml.v2/scannerc.go
index 2c9d5111f..074484455 100644
--- a/vendor/gopkg.in/yaml.v2/scannerc.go
+++ b/vendor/gopkg.in/yaml.v2/scannerc.go
@@ -611,7 +611,7 @@ func yaml_parser_set_scanner_tag_error(parser *yaml_parser_t, directive bool, co
 	if directive {
 		context = "while parsing a %TAG directive"
 	}
-	return yaml_parser_set_scanner_error(parser, context, context_mark, "did not find URI escaped octet")
+	return yaml_parser_set_scanner_error(parser, context, context_mark, problem)
 }
 
 func trace(args ...interface{}) func() {
@@ -1944,7 +1944,7 @@ func yaml_parser_scan_tag_handle(parser *yaml_parser_t, directive bool, start_ma
 	} else {
 		// It's either the '!' tag or not really a tag handle.  If it's a %TAG
 		// directive, it's an error.  If it's a tag token, it must be a part of URI.
-		if directive && !(s[0] == '!' && s[1] == 0) {
+		if directive && string(s) != "!" {
 			yaml_parser_set_scanner_tag_error(parser, directive,
 				start_mark, "did not find expected '!'")
 			return false
@@ -1959,6 +1959,7 @@ func yaml_parser_scan_tag_handle(parser *yaml_parser_t, directive bool, start_ma
 func yaml_parser_scan_tag_uri(parser *yaml_parser_t, directive bool, head []byte, start_mark yaml_mark_t, uri *[]byte) bool {
 	//size_t length = head ? strlen((char *)head) : 0
 	var s []byte
+	hasTag := len(head) > 0
 
 	// Copy the head if needed.
 	//
@@ -2000,10 +2001,10 @@ func yaml_parser_scan_tag_uri(parser *yaml_parser_t, directive bool, head []byte
 		if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) {
 			return false
 		}
+		hasTag = true
 	}
 
-	// Check if the tag is non-empty.
-	if len(s) == 0 {
+	if !hasTag {
 		yaml_parser_set_scanner_tag_error(parser, directive,
 			start_mark, "did not find expected tag URI")
 		return false
-- 
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