Added "Latest Stable Version" and "Total Downloads" Badges

README.md

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 # Predis #
+[![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)
 
 Predis is a flexible and feature-complete PHP (>= 5.3) client library for the Redis key-value store.