Added another cool badge

README.md

@@ -1,5 +1,6 @@
 [![Build Status](https://travis-ci.org/sh4nks/flaskbb.svg?branch=master)](https://travis-ci.org/sh4nks/flaskbb)
 [![Coverage Status](https://coveralls.io/repos/sh4nks/flaskbb/badge.png)](https://coveralls.io/r/sh4nks/flaskbb)
+[![License](https://img.shields.io/badge/license-BSD-blue.svg)](https://flaskbb.org)
 
 # INTRODUCTION