[README] Updated link to license file

Now points to Bitbucket instead of Github.

Author: vimishor

README.md

@@ -1,7 +1,7 @@
 # PHP Bitbucket API
 
 [![Latest Version](https://img.shields.io/packagist/v/gentle/bitbucket-api.svg?style=flat-square)](https://packagist.org/packages/gentle/bitbucket-api)
-[![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square)](https://github.com/gentlero/bitbucket-api/blob/master/LICENSE)
+[![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square)](https://bitbucket.org/gentlero/bitbucket-api/src/master/LICENSE)
 [![Build Status](https://img.shields.io/travis/gentlero/bitbucket-api/master.svg?style=flat-square)](https://travis-ci.org/gentlero/bitbucket-api)
 [![Coverage Status](https://img.shields.io/scrutinizer/coverage/b/gentlero/bitbucket-api.svg?style=flat-square)](https://scrutinizer-ci.com/b/gentlero/bitbucket-api/?branch=develop)
 [![Code quality](https://img.shields.io/scrutinizer/b/gentlero/bitbucket-api.svg?style=flat-square)](https://scrutinizer-ci.com/b/gentlero/bitbucket-api/?branch=develop)