docs: Advertise irc channel instead of the old matrix channel

 CONTRIBUTING.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1434225..b12c11b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,8 +1,8 @@
 ## Contributing to river
 
 Contributing is a simple as opening a pull request on github. You'll likely
-have more success with your contribution if you hop on our
-[matrix channel](https://matrix.to/#/#river:matrix.org) to discuss your plans
+have more success with your contribution if you visit
+[#river](https://webchat.freenode.net/#river) on chat.freenode.net to discuss your plans
 first.
 
 ## Commit messages