Use SVG badges

Author: korny

README.markdown

@@ -1,8 +1,8 @@
 # CodeRay
 
-[![Build Status](https://travis-ci.org/rubychan/coderay.png)](https://travis-ci.org/rubychan/coderay)
-[![Gem Version](https://badge.fury.io/rb/coderay.png)](http://badge.fury.io/rb/coderay)
-[![Dependency Status](https://gemnasium.com/rubychan/coderay.png)](https://gemnasium.com/rubychan/coderay)
+[![Build Status](https://travis-ci.org/rubychan/coderay.svg?branch=master)](https://travis-ci.org/rubychan/coderay)
+[![Gem Version](https://badge.fury.io/rb/coderay.svg)](https://badge.fury.io/rb/coderay)
+[![Dependency Status](https://gemnasium.com/rubychan/coderay.svg)](https://gemnasium.com/rubychan/coderay)
 
 ## About