Add download count badge

README.md

@@ -3,7 +3,7 @@
 
 [Read the blogpost](https://medium.com/delightful-ui-for-ember-apps/creating-an-ember-cli-addon-detecting-ember-js-components-entering-or-leaving-the-viewport-7d95ceb4f5ed)
 
-[![npm version](https://badge.fury.io/js/ember-in-viewport.svg)](http://badge.fury.io/js/ember-in-viewport) [![Build Status](https://travis-ci.org/dockyard/ember-in-viewport.svg)](https://travis-ci.org/dockyard/ember-in-viewport) [![Ember Observer Score](http://emberobserver.com/badges/ember-in-viewport.svg)](http://emberobserver.com/addons/ember-in-viewport)
+![Download count all time](https://img.shields.io/npm/dt/ember-in-viewport.svg) [![npm version](https://badge.fury.io/js/ember-in-viewport.svg)](http://badge.fury.io/js/ember-in-viewport) [![Build Status](https://travis-ci.org/DockYard/ember-in-viewport.svg)](https://travis-ci.org/dockyard/ember-in-viewport) [![Ember Observer Score](http://emberobserver.com/badges/ember-in-viewport.svg)](http://emberobserver.com/addons/ember-in-viewport)
 
 This `ember-cli` addon adds a simple, highly performant Ember Mixin to your app. This Mixin, when added to a `View` or `Component` (collectively referred to as `Components`), will allow you to check if that `Component` has entered the browser's viewport. By default, the Mixin uses the `requestAnimationFrame` API if it detects it in your user's browser – failing which, it fallsback to using the Ember run loop and event listeners.