Update Code School URL to include campaign tracking info per Mark K.

Author: Derek Lindahl

_data/sponsors.yml

@@ -369,7 +369,7 @@
   url: https://www.codeschool.com/
   event: Segway Tour
   description: >
-    [Code School](https://www.codeschool.com/) is an online learning destination
+    [Code School](https://www.codeschool.com/?utm_source=js_cnf&utm_medium=sponsorship&utm_campaign=segway) is an online learning destination
     for existing and aspiring developers that teaches through entertaining
     content. Each course is built around a creative theme and storyline so that
     it feels like you’re playing a game, not sitting in a classroom. We combine