Update vendor/

vendor/github.com/emersion/go-message/mail/text.go

@@ -0,0 +1,18 @@
+package mail
+
+import (
+	"github.com/emersion/go-message"
+)
+
+// A TextHeader represents a message text header.
+type TextHeader struct {
+	message.Header
+}
+
+// NewTextHeader creates a new message text header.
+func NewTextHeader() TextHeader {
+	h := TextHeader{make(message.Header)}
+	h.Set("Content-Disposition", "inline")
+	h.Set("Content-Transfer-Encoding", "quoted-printable")
+	return h
+}