add build status badge pointing at core

README.md

@@ -1,5 +1,4 @@
-[![Build Status](https://travis-ci.org/statonlab/tripal.svg?branch=7.x-3.x)](https://travis-ci.org/statonlab/tripal)
-
+[![7.x-3.x Build Status](https://travis-ci.org/tripal/tripal.svg?branch=7.x-3.x)](https://travis-ci.org/tripal/tripal)
 
 ![alt tag](https://raw.githubusercontent.com/tripal/tripal/7.x-3.x/tripal/theme/images/tripal_logo.png)