chore: add license badge (#387)

* chore: add license badge

* Move license badge to the rest of the badges

Author: Hongarc

README.md

@@ -9,6 +9,7 @@ Dotenv is a zero-dependency module that loads environment variables from a `.env
 [![NPM version](https://img.shields.io/npm/v/dotenv.svg?style=flat-square)](https://www.npmjs.com/package/dotenv)
 [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/feross/standard)
 [![Coverage Status](https://img.shields.io/coveralls/motdotla/dotenv/master.svg?style=flat-square)](https://coveralls.io/github/motdotla/dotenv?branch=coverall-intergration)
+[![LICENSE](https://img.shields.io/github/license/motdotla/dotenv.svg)](LICENSE)
 
 ## Install
 
@@ -262,10 +263,6 @@ See [CONTRIBUTING.md](CONTRIBUTING.md)
 
 See [CHANGELOG.md](CHANGELOG.md)
 
-## License
-
-See [LICENSE](LICENSE)
-
 ## Who's using dotenv?
 
 [These npm modules depend on it.](https://www.npmjs.com/browse/depended/dotenv)