Update build status image in README

Author: weavejester

README.md

@@ -1,6 +1,6 @@
 # Ring-Codec
 
-[![Build Status](https://travis-ci.org/ring-clojure/ring-codec.svg?branch=master)](https://travis-ci.org/ring-clojure/ring-codec)
+[![Build Status](https://app.travis-ci.com/ring-clojure/ring-codec.svg?branch=master)](https://app.travis-ci.com/ring-clojure/ring-codec)
 
 Functions for encoding and decoding data into formats commonly used in
 web applications.