Only display result of master branch on travis badge

README.md

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 > What could be more logical awesome than no logic at all?
 
-[![Build Status](https://travis-ci.org/janl/mustache.js.svg)](https://travis-ci.org/janl/mustache.js) [![Gitter chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/janl/mustache.js)
+[![Build Status](https://travis-ci.org/janl/mustache.js.svg?branch=master)](https://travis-ci.org/janl/mustache.js) [![Gitter chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/janl/mustache.js)
 
 [mustache.js](http://github.com/janl/mustache.js) is an implementation of the [mustache](http://mustache.github.com/) template system in JavaScript.