show master branch build in readme

Author: dbu

README.md

@@ -1,6 +1,6 @@
 # Symfony CMF Routing Bundle
 
-[![Build Status](https://secure.travis-ci.org/symfony-cmf/RoutingBundle.png)](http://travis-ci.org/symfony-cmf/RoutingBundle)
+[![Build Status](https://travis-ci.org/symfony-cmf/RoutingBundle.svg?branch=master)](https://travis-ci.org/symfony-cmf/RoutingBundle)
 [![Latest Stable Version](https://poser.pugx.org/symfony-cmf/routing-bundle/version.png)](https://packagist.org/packages/symfony-cmf/routing-bundle)
 [![Total Downloads](https://poser.pugx.org/symfony-cmf/routing-bundle/d/total.png)](https://packagist.org/packages/symfony-cmf/routing-bundle)