Add travis badge to README

Author: cedricziel

README.md

@@ -1,6 +1,6 @@
 # TYPO3 CMS Plugin for IntelliJ IDEA / PhpStorm
 
-[![TYPO3 CMS Plugin for IntelliJ IDEA / PhpStorm in the Jetrbains Plugin repository](https://img.shields.io/jetbrains/plugin/d/9496-typo3-cms-plugin.svg)](https://plugins.jetbrains.com/plugin/9496-typo3-cms-plugin)
+[![TYPO3 CMS Plugin for IntelliJ IDEA / PhpStorm in the Jetrbains Plugin repository](https://img.shields.io/jetbrains/plugin/d/9496-typo3-cms-plugin.svg)](https://plugins.jetbrains.com/plugin/9496-typo3-cms-plugin) [![Build Status](https://travis-ci.org/cedricziel/idea-php-typo3-plugin.svg?branch=master)](https://travis-ci.org/cedricziel/idea-php-typo3-plugin)
 
 [TYPO3 CMS Plugin in Jetbrains plugin repository](https://plugins.jetbrains.com/idea/plugin/9496-typo3-cms-plugin)