Use svg instead of png to get better image quality

Author: PeterDaveHello

README.md

@@ -20,7 +20,7 @@
 
 [Vundle] is undergoing an [interface change], please stay up to date to get latest changes.
 
-[![Gitter-chat](https://badges.gitter.im/gmarik/Vundle.vim.png)](https://gitter.im/gmarik/Vundle.vim) for discussion and support.
+[![Gitter-chat](https://badges.gitter.im/gmarik/Vundle.vim.svg)](https://gitter.im/gmarik/Vundle.vim) for discussion and support.
 
 ![Vundle-installer](http://i.imgur.com/Rueh7Cc.png)