Merge pull request NeXTs#147 from styfle/patch-1

Add badges for size and downloads

Author: NeXTs

README.md

@@ -2,6 +2,9 @@
 [![Clusterize.js on NPM](https://img.shields.io/npm/v/clusterize.js.svg)](https://www.npmjs.com/package/clusterize.js) 
 [![Clusterize.js on Bower](https://img.shields.io/bower/v/clusterize.svg)](http://bower.io/search/?q=clusterize)
 [![Package Quality](http://npm.packagequality.com/shield/clusterize.js.svg)](http://packagequality.com/#?package=clusterize.js)
+[![Gzip Size](http://img.badgesize.io/https://cdn.jsdelivr.net/npm/clusterize.js/clusterize.min.js?compression=gzip)](https://cdn.jsdelivr.net/npm/clusterize.js/clusterize.min.js)
+[![Install Size](https://packagephobia.now.sh/badge?p=clusterize.js)](https://packagephobia.now.sh/result?p=clusterize.js)
+[![Download Count](https://img.shields.io/npm/dt/clusterize.js.svg)](https://www.npmjs.com/package/clusterize.js)
 [![Join the chat at https://gitter.im/NeXTs/Clusterize.js](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/NeXTs/Clusterize.js?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 > Tiny vanilla JS plugin to display large data sets easily