Added Travis build status icon

Author: paliarush

README.md

@@ -1,6 +1,6 @@
 # Magento 2 Kubernetes DevBox
 
-[![Tests passing on OSX](docs/images/tests_badge.png)](https://github.com/paliarush/magento2-vagrant-for-developers-tests/tree/magento2-kubernetes-devbox-prototype)
+[![Build Status](https://travis-ci.com/magento/magento2-kubernetes-devbox.svg?branch=master)](https://travis-ci.com/magento/magento2-kubernetes-devbox)
 <!--[![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)-->
 [![Semver](http://img.shields.io/SemVer/2.0.0.png?color=blue)](http://semver.org/spec/v2.0.0.html)
 <!--[![Latest GitHub release](docs/images/release_badge.png)](https://github.com/paliarush/magento2-vagrant-for-developers/releases/latest)-->