fix the travis build icon

Author: ryanflorence

README.md

@@ -1,7 +1,7 @@
 React Router
 ============
 
-[![Build Status](https://travis-ci.org/rpflorence/react-nested-router.svg?branch=master)](https://travis-ci.org/rpflorence/react-nested-router)
+[![Build Status](https://travis-ci.org/rpflorence/react-router.svg?branch=master)](https://travis-ci.org/rpflorence/react-router)
 
 A complete routing library for React.