Update README.md

Author: joowani

README.md

@@ -3,7 +3,7 @@ Python-Arango
 
 Python Driver for ArangoDB REST API
 
-[![Build Status](https://travis-ci.org/Joowani/python-arango.svg?branch=master)](https://travis-ci.org/Joowani/python-arango)
+[![Build Status](https://travis-ci.org/joowani/python-arango.svg?branch=master)](https://travis-ci.org/Joowani/python-arango)
 
 Overview
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