Fix broken badges

Author: ghaiklor

README.md

@@ -1,16 +1,10 @@
 casbin-mongoose-adapter
-====
-[![NPM version][npm-image]][npm-url]
-[![NPM download][download-image]][download-url]
-[![Build Status](https://travis-ci.org/elasticio/casbin-mongoose-adapter.svg?branch=master)](https://travis-ci.org/elasticio/casbin-mongoose-adapter)
-[![Coverage Status](https://coveralls.io/repos/github/elasticio/casbin-mongoose-adapter/badge.svg?branch=master)](https://coveralls.io/github/elasticio/casbin-mongoose-adapter?branch=master)
+===
+[![NPM version](https://img.shields.io/npm/v/@elastic.io/casbin-mongoose-adapter.svg?style=flat-square)](https://npmjs.com/package/@elastic.io/casbin-mongoose-adapter)
+[![NPM download](https://img.shields.io/npm/dm/@elastic.io/casbin-mongoose-adapter.svg?style=flat-square)](https://npmjs.com/package/@elastic.io/casbin-mongoose-adapter)
+[![CircleCI](https://circleci.com/gh/elasticio/casbin-mongoose-adapter/tree/master.svg?style=svg)](https://circleci.com/gh/elasticio/casbin-mongoose-adapter/tree/master)
 [![Release](https://img.shields.io/github/release/elasticio/casbin-mongoose-adapter.svg)](https://github.com/elasticio/casbin-mongoose-adapter/releases/latest)
 
-[npm-image]: https://img.shields.io/npm/v/@elastic.io/casbin-mongoose-adapter.svg?style=flat-square
-[npm-url]: https://npmjs.com/package/@elastic.io/casbin-mongoose-adapter
-[download-image]: https://img.shields.io/npm/dm/@elastic.io/casbin-mongoose-adapter.svg?style=flat-square
-[download-url]: https://npmjs.com/package/@elastic.io/casbin-mongoose-adapter
-
 MongoDB policy storage, implemented as an adapter for [node-casbin](https://github.com/casbin/node-casbin).
 
 ## Getting Started