Update vendor/

vendor/github.com/emersion/go-textwrapper/.gitignore

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+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

vendor/github.com/emersion/go-textwrapper/.travis.yml

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+language: go

vendor/github.com/emersion/go-textwrapper/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 emersion
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/emersion/go-textwrapper/README.md

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+# go-textwrapper
+
+[![GoDoc](https://godoc.org/github.com/emersion/go-textwrapper?status.svg)](https://godoc.org/github.com/emersion/go-textwrapper)
+[![Build Status](https://travis-ci.org/emersion/go-textwrapper.svg?branch=master)](https://travis-ci.org/emersion/go-textwrapper)
+
+A writer that wraps long text lines to a specified length
+
+## Usage
+
+```go
+import (
+	"os"
+
+	"github.com/emersion/go-textwrapper"
+)
+
+func main() {
+	w := textwrapper.New(os.Stdout, "/", 5)
+
+	w.Write([]byte("helloworldhelloworldhelloworld"))
+	// Output: hello/world/hello/world/hello/world
+}
+```
+
+## License
+
+MIT

vendor/github.com/emersion/go-textwrapper/wrapper.go

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+// A writer that wraps long text lines to a specified length.
+package textwrapper
+
+import (
+	"io"
+)
+
+type writer struct {
+	Sep string
+	Len int
+
+	w io.Writer
+	i int
+}
+
+func (w *writer) Write(b []byte) (N int, err error) {
+	to := w.Len - w.i
+
+	for len(b) > to {
+		var n int
+		n, err = w.w.Write(b[:to])
+		if err != nil {
+			return
+		}
+		N += n
+		b = b[to:]
+
+		_, err = w.w.Write([]byte(w.Sep))
+		if err != nil {
+			return
+		}
+
+		w.i = 0
+		to = w.Len
+	}
+
+	w.i += len(b)
+
+	n, err := w.w.Write(b)
+	if err != nil {
+		return
+	}
+	N += n
+
+	return
+}
+
+// Returns a writer that splits its input into multiple parts that have the same
+// length and adds a separator between these parts.
+func New(w io.Writer, sep string, l int) io.Writer {
+	return &writer{
+		Sep: sep,
+		Len: l,
+		w: w,
+	}
+}
+
+// Creates a RFC822 text wrapper. It adds a CRLF (ie. \r\n) each 76 characters.
+func NewRFC822(w io.Writer) io.Writer {
+	return New(w, "\r\n", 76)
+}