Moving IRC network reference to OFTC

Change-Id: I9ff4436aef9e7a185cbae067323e344465e222cc

Author: Ghanshyam Mann

README.rst

@@ -34,7 +34,7 @@ Contributing
 We are welcoming new contributors, if you've got new ideas, suggestions or want
 to contribute, contact us.
 
-You can reach us through IRC (#cloudkitty @freenode.net), or on the official
+You can reach us through IRC (#cloudkitty @oftc.net), or on the official
 OpenStack mailing list [email protected].
 
 A storyboard_ project is available if you need to report bugs.