Use fancy flat style Shields IO badges.

README.md

@@ -1,8 +1,8 @@
 # MachineTag
 
-[![Gem Version](http://img.shields.io/gem/v/machine_tag.svg)][gem]
-[![Build Status](http://img.shields.io/travis/douglaswth/machine_tag.svg)][travis]
-[![Dependency Status](http://img.shields.io/gemnasium/douglaswth/machine_tag.svg)](gemnasium)
+[![Gem Version](http://img.shields.io/gem/v/machine_tag.svg?style=flat)][gem]
+[![Build Status](http://img.shields.io/travis/douglaswth/machine_tag.svg?style=flat)][travis]
+[![Dependency Status](http://img.shields.io/gemnasium/douglaswth/machine_tag.svg?style=flat)](gemnasium)
 
 [gem]: https://rubygems.org/gems/machine_tag
 [travis]: http://travis-ci.org/douglaswth/machine_tag