Update vendor/

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