docs(readme): remove incorrect download count badge

npm doesn't currently support download counts for scoped packages, so there is no replacement right now.

README.md

@@ -4,7 +4,6 @@
 [![Issue Stats](http://issuestats.com/github/angular/angular/badge/pr?style=flat)](http://issuestats.com/github/angular/angular)
 [![Issue Stats](http://issuestats.com/github/angular/angular/badge/issue?style=flat)](http://issuestats.com/github/angular/angular)
 [![npm version](https://badge.fury.io/js/%40angular%2Fcore.svg)](https://badge.fury.io/js/%40angular%2Fcore)
-[![Downloads](http://img.shields.io/npm/dm/angular2.svg)](https://npmjs.org/package/angular2)
 
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/angular2-ci.svg)](https://saucelabs.com/u/angular2-ci)  
 *Safari (7+), iOS (7+), Edge (14) and IE mobile (11) are tested on [BrowserStack][browserstack].*