Added packagist badge

Author: tersmitten

README.md

@@ -1,6 +1,6 @@
 # Redis (DataSource) plugin for CakePHP
 
-[![Build Status](https://travis-ci.org/Oefenweb/cakephp-redis.png?branch=master)](https://travis-ci.org/Oefenweb/cakephp-redis) [![Coverage Status](https://coveralls.io/repos/Oefenweb/cakephp-redis/badge.png)](https://coveralls.io/r/Oefenweb/cakephp-redis)
+[![Build Status](https://travis-ci.org/Oefenweb/cakephp-redis.png?branch=master)](https://travis-ci.org/Oefenweb/cakephp-redis) [![Coverage Status](https://coveralls.io/repos/Oefenweb/cakephp-redis/badge.png)](https://coveralls.io/r/Oefenweb/cakephp-redis) [![Packagist downloads](http://img.shields.io/packagist/dt/Oefenweb/cakephp-redis.svg)](https://packagist.org/packages/oefenweb/cakephp-redis)
 
 The Redis (DataSource) plugin ...