Add more badges to README.

README.md

@@ -2,6 +2,9 @@
 
 [![Latest Stable Version](https://poser.pugx.org/predis/predis/v/stable.png)](https://packagist.org/packages/predis/predis)
 [![Total Downloads](https://poser.pugx.org/predis/predis/downloads.png)](https://packagist.org/packages/predis/predis)
+[![License](https://poser.pugx.org/predis/predis/license.svg)](https://packagist.org/packages/predis/predis)
+[![Build Status](https://travis-ci.org/nrk/predis.svg?branch=master)](https://travis-ci.org/nrk/predis)
+[![HHVM Status](http://hhvm.h4cc.de/badge/predis/predis.png)](http://hhvm.h4cc.de/package/predis/predis)
 
 Predis is a flexible and feature-complete [Redis](http://redis.io) client library for PHP >= 5.3.