Add CDNJS & npm version badges in README.md

These badges will show the version on CDNJS & npm

README.md

@@ -2,6 +2,8 @@
 
 [![Build Status](https://travis-ci.org/artf/grapesjs.svg?branch=master)](https://travis-ci.org/artf/grapesjs)
 [![Chat](https://img.shields.io/badge/chat-discord-7289da.svg)](https://discord.gg/QAbgGXq)
+[![CDNJS](https://img.shields.io/cdnjs/v/grapesjs.svg)](https://cdnjs.com/libraries/grapesjs)
+[![npm](https://img.shields.io/npm/v/grapesjs.svg)](https://www.npmjs.com/package/grapesjs)
 
 <p align="center"><img src="http://grapesjs.com/img/grapesjs-front-page-m.jpg" alt="GrapesJS" width="500" align="center"/></p>