Remove readme badges

Remove support for CodeClimate and Greenkeeper.

README.md

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 ## An authenticator and library for using ember-simple-auth and AWS Amplify/Cognito
 
 [![Build Status](https://travis-ci.org/paulcwatts/ember-cognito.svg?branch=master)](https://travis-ci.org/paulcwatts/ember-cognito)
-[![Code Climate](https://codeclimate.com/github/paulcwatts/ember-cognito/badges/gpa.svg)](https://codeclimate.com/github/paulcwatts/ember-cognito)
 [![Ember Observer Score](https://emberobserver.com/badges/ember-cognito.svg)](https://emberobserver.com/addons/ember-cognito)
-[![Test Coverage](https://codeclimate.com/github/paulcwatts/ember-cognito/badges/coverage.svg)](https://codeclimate.com/github/paulcwatts/ember-cognito/coverage)
 [![npm version](https://badge.fury.io/js/ember-cognito.svg)](https://badge.fury.io/js/ember-cognito)
-[![Greenkeeper badge](https://badges.greenkeeper.io/paulcwatts/ember-cognito.svg)](https://greenkeeper.io/)
 
 Ember Cognito is an Ember Addon that integrates 
 [ember-simple-auth](https://github.com/simplabs/ember-simple-auth/)