Add npm badges

Author: niklasvh

README.md

@@ -3,7 +3,10 @@ html2canvas
 
 [Homepage](https://html2canvas.hertzen.com) | [Downloads](https://github.com/niklasvh/html2canvas/releases) | [Questions](http://stackoverflow.com/questions/tagged/html2canvas?sort=newest) | [Donate](https://www.gittip.com/niklasvh/)
 
-[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/niklasvh/html2canvas?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Build Status](https://travis-ci.org/niklasvh/html2canvas.svg)](https://travis-ci.org/niklasvh/html2canvas)
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/niklasvh/html2canvas?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) 
+[![Build Status](https://travis-ci.org/niklasvh/html2canvas.svg)](https://travis-ci.org/niklasvh/html2canvas)
+[![NPM Downloads](https://img.shields.io/npm/dm/html2canvas.svg)](https://www.npmjs.org/package/html2canvas)
+[![NPM Version](https://img.shields.io/npm/v/html2canvas.svg)](https://www.npmjs.org/package/html2canvas)
 
 #### JavaScript HTML renderer ####