Add build badge

Author: mblaschke

README.md

@@ -2,6 +2,7 @@
 
 [![GitHub release](https://img.shields.io/github/release/webdevops/goreplace.svg)](https://github.com/webdevops/goreplace/releases)
 [![license](https://img.shields.io/github/license/webdevops/goreplace.svg)](https://github.com/webdevops/goreplace/blob/master/LICENSE)
+[![Build Status](https://travis-ci.org/webdevops/goreplace.svg?branch=master)](https://travis-ci.org/webdevops/goreplace)
 
 Cli utility for replacing text in files, written in golang and compiled for usage in Docker images