Change the circleci badge to shield style

README.md

@@ -1,6 +1,6 @@
 # ember-cli-bootstrap3-tooltip [![GitHub version](https://badge.fury.io/gh/cybertoothca%2Fember-cli-bootstrap3-tooltip.svg)](https://badge.fury.io/gh/cybertoothca%2Fember-cli-bootstrap3-tooltip)
 
-[![CircleCI](https://circleci.com/gh/cybertoothca/ember-cli-bootstrap3-tooltip.svg?style=svg)](https://circleci.com/gh/cybertoothca/ember-cli-bootstrap3-tooltip) [![npm version](https://badge.fury.io/js/ember-cli-bootstrap3-tooltip.svg)](https://badge.fury.io/js/ember-cli-bootstrap3-tooltip) [![Code Climate](https://codeclimate.com/github/cybertoothca/ember-cli-bootstrap3-tooltip/badges/gpa.svg)](https://codeclimate.com/github/cybertoothca/ember-cli-bootstrap3-tooltip) ![Dependencies](https://david-dm.org/cybertoothca/ember-cli-bootstrap3-tooltip.svg) [![ember-observer-badge](http://emberobserver.com/badges/ember-cli-bootstrap3-tooltip.svg)](http://emberobserver.com/addons/ember-cli-bootstrap3-tooltip) [![License](https://img.shields.io/npm/l/ember-cli-bootstrap3-tooltip.svg)](LICENSE.md)
+[![npm version](https://badge.fury.io/js/ember-cli-bootstrap3-tooltip.svg)](https://badge.fury.io/js/ember-cli-bootstrap3-tooltip) [![CircleCI](https://circleci.com/gh/cybertoothca/ember-cli-bootstrap3-tooltip.svg?style=shield)](https://circleci.com/gh/cybertoothca/ember-cli-bootstrap3-tooltip) [![Code Climate](https://codeclimate.com/github/cybertoothca/ember-cli-bootstrap3-tooltip/badges/gpa.svg)](https://codeclimate.com/github/cybertoothca/ember-cli-bootstrap3-tooltip) ![Dependencies](https://david-dm.org/cybertoothca/ember-cli-bootstrap3-tooltip.svg) [![ember-observer-badge](http://emberobserver.com/badges/ember-cli-bootstrap3-tooltip.svg)](http://emberobserver.com/addons/ember-cli-bootstrap3-tooltip) [![License](https://img.shields.io/npm/l/ember-cli-bootstrap3-tooltip.svg)](LICENSE.md)
 
 This addon provides several components that will generate [Bootstrap
 Tooltips](http://getbootstrap.com/javascript/#tooltips) from the