Update README.md

Author: cebe

README.md

@@ -5,6 +5,7 @@ Read and write [OpenAPI](https://www.openapis.org/) 3.0.x YAML and JSON files an
 It also provides a CLI tool for validating and converting OpenAPI 3.0.x YAML and JSON files.
 
 [![Latest Stable Version](https://poser.pugx.org/cebe/php-openapi/v/stable)](https://packagist.org/packages/cebe/php-openapi)
+[![Total Downloads](https://poser.pugx.org/cebe/php-openapi/downloads)](https://packagist.org/packages/cebe/php-openapi)
 [![Build Status](https://travis-ci.org/cebe/php-openapi.svg?branch=master)](https://travis-ci.org/cebe/php-openapi)
 [![License](https://poser.pugx.org/cebe/php-openapi/license)](https://packagist.org/packages/cebe/php-openapi)