README: Use SVG badges

README.md

@@ -3,7 +3,7 @@ provided by freedesktop.org (see http://freedesktop.org/wiki/Software/shared-mim
 
 [![Gem Version](https://img.shields.io/gem/v/mimemagic.svg)](http://rubygems.org/gems/mimemagic)
 [![Gem Downloads](https://img.shields.io/gem/dt/mimemagic.svg)](http://rubygems.org/gems/mimemagic)
-[![Build Status](https://secure.travis-ci.org/minad/mimemagic.png?branch=master)](http://travis-ci.org/minad/mimemagic) [![Code Climate](https://codeclimate.com/github/minad/mimemagic.png)](https://codeclimate.com/github/minad/mimemagic)
+[![Build Status](https://secure.travis-ci.org/minad/mimemagic.svg?branch=master)](http://travis-ci.org/minad/mimemagic) [![Code Climate](https://codeclimate.com/github/minad/mimemagic.svg)](https://codeclimate.com/github/minad/mimemagic)
 [![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=min4d&url=https://github.com/minad/mimemagic&title=MimeMagic&language=&tags=github&category=software)
 
 Usage