adding travis build badge to README

README.md

@@ -2,6 +2,8 @@
 
 [![Join the chat at https://gitter.im/eriksvedang/Carp](https://badges.gitter.im/eriksvedang/Carp.svg)](https://gitter.im/eriksvedang/Carp?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
+[![Build Status](https://travis-ci.org/carp-lang/Carp.svg?branch=master)](https://travis-ci.org/carp-lang/Carp)
+
 <img src="https://github.com/carp-lang/Carp/blob/master/img/carp_logo_300_c.png" alt="Logo" align="right" />
 
 <i>WARNING! This is a research project and a lot of information here might become outdated and misleading without any explanation. Don't use it for anything important!</i>