Change from pythontesting.net to pythontest.com (#485)

Fix #485

Author: matrixise

config/config.ini

@@ -189,7 +189,7 @@ name = Brendan Scott
 [https://snarky.ca/rss/]
 name = Brett Cannon
 
-[http://pythontesting.net/on/planet/feed]
+[http://pythontest.com/posts/index.xml]
 name = Brian Okken
 
 [http://nicoddemus.github.io/tag/python/atom.xml]