SVG Badge Update

This change updates the badges in this project to use SVG.

README.md

@@ -1,8 +1,8 @@
 # Git Pivotal Tracker Integration
-[![Build Status](https://travis-ci.org/nebhale/git-pivotal-tracker-integration.png?branch=master)](https://travis-ci.org/nebhale/git-pivotal-tracker-integration)
+[![Build Status](https://travis-ci.org/nebhale/git-pivotal-tracker-integration.svg?branch=master)](https://travis-ci.org/nebhale/git-pivotal-tracker-integration)
 [![Gem Version](https://badge.fury.io/rb/git-pivotal-tracker-integration.png)](http://badge.fury.io/rb/git-pivotal-tracker-integration)
-[![Dependency Status](https://gemnasium.com/nebhale/git-pivotal-tracker-integration.png)](http://gemnasium.com/nebhale/git-pivotal-tracker-integration)
-[![Code Climate](https://codeclimate.com/github/nebhale/git-pivotal-tracker-integration.png)](https://codeclimate.com/github/nebhale/git-pivotal-tracker-integration)
+[![Dependency Status](https://gemnasium.com/nebhale/git-pivotal-tracker-integration.svg)](https://gemnasium.com/nebhale/git-pivotal-tracker-integration)
+[![Code Climate](https://codeclimate.com/github/nebhale/git-pivotal-tracker-integration.svg)](https://codeclimate.com/github/nebhale/git-pivotal-tracker-integration)
 
 
 `git-pivotal-tracker-integration` provides a set of additional Git commands to help developers when working with [Pivotal Tracker][pivotal-tracker].