Added buttons

Author: dabeeeenster

README.md

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 <img width="100%" src="https://github.com/Flagsmith/flagsmith/raw/main/static-files/hero.png"/>
 
+[![Packagist Version](https://img.shields.io/packagist/v/flagsmith/flagsmith-php-client)](https://packagist.org/packages/flagsmith/flagsmith-php-client)
+[![Packagist Downloads](https://img.shields.io/packagist/dm/flagsmith/flagsmith-php-client)](https://packagist.org/packages/flagsmith/flagsmith-php-client)
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 # Flagsmith PHP SDK
 
 > Flagsmith allows you to manage feature flags and remote config across multiple projects, environments and organisations.