Add some badges

README.md

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 # ember-scroll-operator
 
+[![npm version](https://badge.fury.io/js/ember-scroll-operator.svg)](http://badge.fury.io/js/ember-scroll-operator)
+[![npm](https://img.shields.io/npm/dm/ember-scroll-operator.svg)]()
+[![Ember Observer Score](http://emberobserver.com/badges/ember-scroll-operator.svg)](http://emberobserver.com/addons/ember-scroll-operator)
+
 This ember-cli addon provides two route mixins that will handle scroll preservation and resetting. Read more for details.
 
 ## Theme Music