ReactiveCocoa/ReactiveCocoa — pull request #1604 by jspahrsummers (2014-12-08 16:04:37+00:00)
Title: Remove mention of Slack chat room

It's not valuable for most users, being primarily used for conversations between collaborators.

See https://github.com/ReactiveCocoa/ReactiveCocoa/issues/871#issuecomment-66137012.