small changes

CONTRIBUTING.md

@@ -15,9 +15,6 @@ patches and features.
 The issue tracker is the preferred channel for [bug reports](#bugs), and [submitting pull
 requests](#pull-requests), but please respect the following restrictions:
 
-* Please **do not** use the issue tracker for personal support requests (use
-  [Stack Overflow](http://stackoverflow.com) or IRC).
-
 * Please **do not** derail or troll issues. Keep the discussion on topic and
   respect the opinions of others.