Updated README.md

Added downloads badge.

Author: J7mbo

README.md

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 ======================
 Simple PHP Wrapper for Twitter API v1.1 calls
 
+[![Total Downloads](https://poser.pugx.org/j7mbo/twitter-api-php/downloads.png)](https://packagist.org/packages/j7mbo/twitter-api-php)
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 **[Changelog](https://github.com/J7mbo/twitter-api-php/wiki/Changelog)** ||
 **[Examples](https://github.com/J7mbo/twitter-api-php/wiki/Twitter-API-PHP-Wiki)** ||
 **[Wiki](https://github.com/J7mbo/twitter-api-php/wiki)** ||