Update readme with proper CDN links.

README.md

@@ -34,7 +34,7 @@ Add `fuelux` class to the portion of the page using Fuel UX as seen [here](https
 Ensure all the dependencies are included on the page (eg, such as using the CDN as shown below).
 ```
 <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">
-<link href="//www.fuelcdn.com/fuelux/3.14.2/css/fuelux.min.css" rel="stylesheet">
+<link href="//www.fuelcdn.com/fuelux/3.15.0/css/fuelux.min.css" rel="stylesheet">
 
 <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.js"></script>
 <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.1/js/bootstrap.min.js"></script>