docs(readme): add npm badge

Author: Awk34

Diff for: readme.md

@@ -1,5 +1,5 @@
 # AngularJS Full-Stack generator
-[![Build Status](https://travis-ci.org/DaftMonk/generator-angular-fullstack.svg?branch=master)](http://travis-ci.org/DaftMonk/generator-angular-fullstack) ![](https://david-dm.org/daftmonk/generator-angular-fullstack.png) [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/DaftMonk/generator-angular-fullstack)
+[![Build Status](https://travis-ci.org/DaftMonk/generator-angular-fullstack.svg?branch=master)](http://travis-ci.org/DaftMonk/generator-angular-fullstack) [![npm version](https://badge.fury.io/js/generator-angular-fullstack.svg)](http://badge.fury.io/js/generator-angular-fullstack) ![](https://david-dm.org/daftmonk/generator-angular-fullstack.png) [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/DaftMonk/generator-angular-fullstack)
 
 > Yeoman generator for creating MEAN stack applications, using MongoDB, Express, AngularJS, and Node - lets you quickly set up a project following best practices.