Add Bitdeli Badge to README

[ci skip]

Author: kevinjalbert

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://secure.travis-ci.org/kevinjalbert/git_statistics.png?branch=master)](http://travis-ci.org/kevinjalbert/git_statistics)
 [![Coverage Status](https://coveralls.io/repos/kevinjalbert/git_statistics/badge.png)](https://coveralls.io/r/kevinjalbert/git_statistics)
 [![Code Climate](https://codeclimate.com/github/kevinjalbert/git_statistics.png)](https://codeclimate.com/github/kevinjalbert/git_statistics)
+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/kevinjalbert/git_statistics/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
 
 # Instructions