Show build status & coverage status in README.md

Author: shochdoerfer

README.md

@@ -3,6 +3,9 @@
 This package provides some additional features for PHPStan to make it
 work for Magento 2 projects.
 
+[![Build Status](https://travis-ci.org/bitExpert/phpstan-magento.svg?branch=master)](https://travis-ci.org/bitExpert/phpstan-magento)
+[![Coverage Status](https://coveralls.io/repos/github/bitExpert/phpstan-magento/badge.svg?branch=master)](https://coveralls.io/github/bitExpert/phpstan-magento?branch=master)
+
 ## Installation
 
 The preferred way of installing `bitexpert/phpstan-magento` is through Composer.