CONTRIBUTING: drop obsolete mailing list and IRC channel
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 57b378a..cb33a08 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,12 +12,6 @@
simple statement that you, as a contributor, have the legal right to make the
contribution. See the [DCO](DCO) file for details.
-# Email and Chat
-
-The project currently uses the general CoreOS email list and IRC channel:
-- Email: [coreos-dev](https://groups.google.com/forum/#!forum/coreos-dev)
-- IRC: #[coreos](irc://irc.freenode.org:6667/#coreos) IRC channel on freenode.org
-
## Getting Started
- Fork the repository on GitHub
