Update README.md

Author: 0x3175633435

README.md

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 # ![](https://i.imgur.com/GH4mQZi.png)
 
 [![Maintainability](https://api.codeclimate.com/v1/badges/02038cb44675b6547994/maintainability)](https://codeclimate.com/github/phphacks/zend-mvc-acl/maintainability)
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+[![Latest Stable Version](https://poser.pugx.org/phphacks/zend-mvc-acl/v/stable)](https://packagist.org/packages/phphacks/zend-mvc-acl)