Updated Travis status image URL

Author: weavejester

README.md

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