Merge v1.2.1-master

Signed-off-by: Emile Vauge <emile@vauge.com>

vendor/github.com/google/go-github/github/strings.go

@@ -16,7 +16,7 @@ import (
 var timestampType = reflect.TypeOf(Timestamp{})
 
 // Stringify attempts to create a reasonable string representation of types in
-// the GitHub library.  It does things like resolve pointers to their values
+// the GitHub library. It does things like resolve pointers to their values
 // and omits struct fields with nil values.
 func Stringify(message interface{}) string {
 	var buf bytes.Buffer