Add download badge to README

Author: renatomarinho

README.md

@@ -4,6 +4,7 @@
 
 <p align="center">
     <a href="https://packagist.org/packages/vinkius-labs/laravel-page-speed"><img src="https://img.shields.io/packagist/v/vinkius-labs/laravel-page-speed?style=flat-square" alt="Latest Version"></a>
+    <a href="https://packagist.org/packages/vinkius-labs/laravel-page-speed"><img src="https://img.shields.io/packagist/dt/renatomarinho/laravel-page-speed?style=flat-square" alt="Total Downloads"></a>
     <a href="https://packagist.org/packages/vinkius-labs/laravel-page-speed"><img src="https://img.shields.io/packagist/l/vinkius-labs/laravel-page-speed?style=flat-square" alt="License"></a>
     <a href="https://github.com/vinkius-labs/laravel-page-speed"><img src="https://img.shields.io/github/stars/vinkius-labs/laravel-page-speed?style=flat-square" alt="GitHub Stars"></a>
     <a href="https://packagist.org/packages/vinkius-labs/laravel-page-speed"><img src="https://img.shields.io/packagist/php-v/vinkius-labs/laravel-page-speed?style=flat-square" alt="PHP Version"></a>