Update badges to use SVG images [ci skip]

README.md

@@ -1,10 +1,17 @@
 # Bluepill
 Bluepill is a simple process monitoring tool written in Ruby.
 
-[![Build Status](https://travis-ci.org/bluepill-rb/bluepill.png)](https://travis-ci.org/bluepill-rb/bluepill)
-[![Dependency Status](https://gemnasium.com/bluepill-rb/bluepill.png)](https://gemnasium.com/bluepill-rb/bluepill)
-[![Code Climate](https://codeclimate.com/github/bluepill-rb/bluepill.png)](https://codeclimate.com/github/bluepill-rb/bluepill)
-[![Coverage Status](https://coveralls.io/repos/bluepill-rb/bluepill/badge.png)](https://coveralls.io/r/bluepill-rb/bluepill)
+[![Gem Version](https://badge.fury.io/rb/bluepill.svg)][gem]
+[![Build Status](https://travis-ci.org/bluepill-rb/bluepill.svg?branch=master)][travis]
+[![Dependency Status](https://gemnasium.com/bluepill-rb/bluepill.svg)][gemnasium]
+[![Code Climate](https://codeclimate.com/github/bluepill-rb/bluepill/badges/gpa.svg)][codeclimate]
+[![Coverage Status](https://coveralls.io/repos/bluepill-rb/bluepill/badge.svg?branch=master&service=github)][coveralls]
+
+[gem]: https://rubygems.org/gems/bluepill
+[travis]: https://travis-ci.org/bluepill-rb/bluepill
+[gemnasium]: https://gemnasium.com/bluepill-rb/bluepill
+[codeclimate]: https://codeclimate.com/github/bluepill-rb/bluepill
+[coveralls]: https://coveralls.io/github/bluepill-rb/bluepill?branch=master
 
 ## Installation
 It's hosted on [rubygems.org][rubygems].