Add IRC channel to the Contributing section

README.md

@@ -2,6 +2,8 @@
 
 ## Contributing
 
+Discussions happen in #bugbug on irc.mozilla.org.
+
 1. Issues marked as `good first issue` are self-contained enough that a contributor should be able to work on them.
 2. Issues marked as `reserved-for-beginners` are reserved for people who have never contributed to the project before.
 3. Issues are to be considered as not assigned, until there is a PR linked to them.