Change TravisCI badge by CircleCI badge

Author: Jan Petr

README.md

@@ -4,7 +4,7 @@ Algolia Search for Magento 2
 ![Latest version](https://img.shields.io/badge/latest-1.11.1-green.svg)
 ![Magento 2](https://img.shields.io/badge/Magento-%3E=2.1-blue.svg)
 ![PHP >= 5.6.5](https://img.shields.io/badge/PHP-%3E=5.6-green.svg)
-[![Build Status](https://travis-ci.org/algolia/algoliasearch-magento-2.svg?branch=master)](https://travis-ci.org/algolia/algoliasearch-magento-2)
+[![CircleCI](https://circleci.com/gh/algolia/algoliasearch-magento-2/tree/master.svg?style=svg)](https://circleci.com/gh/algolia/algoliasearch-magento-2/tree/master)
 
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