Add Chango as another Rubicon Project tracker Progress towards #185.

trackers/chango.com/index.md

-# chango.com
+# Rubicon Project (chango.com)
 
-> Brief description of the tracker – [Source](link)
+> See [rubiconproject.com](/trackers/rubiconproject.com)
 
 ## Ethical design violations
 
   * Tracker
-
+  * Web bug
+  
 <!-- Other ethical design violation badges go here. Valid ones are:
   * Aggressive
   * Doorslam
   * Clickbait
   * Fingerprint
-  * Web bug
 -->
 
 ## Block rule
@@ -43,4 +43,4 @@
 
 ## Notes
 
-  * None yet.
+  * Chango was acquired by Rubicon Project in 2015… “The acquisition enables Rubicon Project to expand its premium advertising marketplace to include intent marketing capabilities, providing access to data-driven targeting and retargeting budgets.” [Source](http://rubiconproject.com/2014-press-releases/rubicon-project-completes-acquisition-chango/)
\ No newline at end of file