licence badge

README.md

@@ -9,6 +9,7 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/orvfo2qgmd1d7a2i?svg=true)](https://ci.appveyor.com/project/yegor256/xcop)
 [![PDD status](http://www.0pdd.com/svg?name=yegor256/xcop)](http://www.0pdd.com/p?name=yegor256/xcop)
 [![Gem Version](https://badge.fury.io/rb/xcop.svg)](http://badge.fury.io/rb/xcop)
+[![License](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/yegor256/xcop/blob/master/LICENSE.txt)
 
 [![Maintainability](https://api.codeclimate.com/v1/badges/396ec0584e0a84adc723/maintainability)](https://codeclimate.com/github/yegor256/xcop/maintainability)
 [![Test Coverage](https://img.shields.io/codecov/c/github/yegor256/xcop.svg)](https://codecov.io/github/yegor256/xcop?branch=master)