Update url for travis badge

Author: MasterOdin

README.md

@@ -1,7 +1,7 @@
 <p align="center">
   <img src="https://raw.githubusercontent.com/lord/img/master/logo-slate.png" alt="Slate: API Documentation Generator" width="226">
   <br>
-  <a href="https://travis-ci.org/lord/slate"><img src="https://travis-ci.org/lord/slate.svg?branch=master" alt="Build Status"></a>
+  <a href="https://travis-ci.com/slatedocs/slate"><img src="https://travis-ci.com/slatedocs/slate.svg?branch=master" alt="Build Status"></a>
 </p>
 
 <p align="center">Slate helps you create beautiful, intelligent, responsive API documentation.</p>