Update README.md

Author: sitingren

README.md

@@ -1,7 +1,10 @@
 # github-release-cli
+
+[![License](https://img.shields.io/badge/License-MIT-yellow.svg)](https://github.com/sitingren/github-release-cli/blob/master/LICENSE)
+
 Command line tool written in Python for creating Github releases through Github REST API.
 
-## Installation
+## Installation / Requirements
 ```
 $ pip install arestclient
 $ git clone git@github.com:sitingren/github-release-cli.git