added downloads badge

README.md

@@ -8,6 +8,7 @@ is the preffered and recommended way to ask ONGR support questions.
 [![Build Status](https://travis-ci.org/ongr-io/ElasticsearchDSL.svg?branch=master)](https://travis-ci.org/ongr-io/ElasticsearchDSL)
 [![Coverage Status](https://coveralls.io/repos/ongr-io/ElasticsearchDSL/badge.svg?branch=master&service=github)](https://coveralls.io/github/ongr-io/ElasticsearchDSL?branch=master)
 [![Latest Stable Version](https://poser.pugx.org/ongr/elasticsearch-dsl/v/stable)](https://packagist.org/packages/ongr/elasticsearch-dsl)
+[![Total Downloads](https://poser.pugx.org/ongr/elasticsearch-dsl/downloads)](https://packagist.org/packages/ongr/elasticsearch-dsl)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/ongr-io/ElasticsearchDSL/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/ongr-io/ElasticsearchDSL/?branch=master)
 
 ## Version matrix