Update go dependencies

vendor/github.com/docker/spdystream/handlers.go

@@ -30,9 +30,7 @@ func MirrorStreamHandler(stream *Stream) {
 	}()
 }
 
-// NoopStreamHandler does nothing when stream connects, most
-// likely used with RejectAuthHandler which will not allow any
-// streams to make it to the stream handler.
+// NoopStreamHandler does nothing when stream connects.
 func NoOpStreamHandler(stream *Stream) {
 	stream.SendReply(http.Header{}, false)
 }