Update README.md

Author: CamDavidsonPilon

README.md

@@ -154,6 +154,8 @@ Reviews
 The publishing model is so unusual. Not only is it open source but it relies on pull requests from anyone in order to progress the book. This is ingenious and heartening" - [excited Reddit user](http://www.reddit.com/r/Python/comments/1alnal/probabilistic_programming_and_bayesian_methods/)
 
 
+#### Mobile? You bet
+
 Available for ALL the mobile devices, as these in real-life screenshots suggest:
 
 ![so real](http://i.imgur.com/6jV4mSr.png)