Update gitter vendor. (fixes crash)

vendor/github.com/sromku/go-gitter/stream.go

@@ -137,7 +137,10 @@ func (stream *Stream) connect() {
 
 	res, err := stream.gitter.getResponse(stream.url, stream)
 	if err != nil || res.StatusCode != 200 {
-		stream.gitter.log(fmt.Sprintf("Failed to get response, trying reconnect (Status code: %v)", res.StatusCode))
+		stream.gitter.log("Failed to get response, trying reconnect")
+		if res != nil {
+			stream.gitter.log(fmt.Sprintf("Status code: %v", res.StatusCode))
+		}
 		stream.gitter.log(err)
 
 		// sleep and wait

vendor/manifest

@@ -384,7 +384,7 @@
 			"importpath": "github.com/sromku/go-gitter",
 			"repository": "https://github.com/sromku/go-gitter",
 			"vcs": "git",
-			"revision": "0b9f26da1844acd3c6c2fd4ee2bdd30eb1a40568",
+			"revision": "16aadfbb65c6641501ea8eebb6bcf23b9011912b",
 			"branch": "master",
 			"notests": true
 		},