Merge pull request #890 from pimutils/irc

Replace Freenode with Libera.Chat

Author: Hugo Barrera

docs/contact.rst

@@ -2,7 +2,7 @@
 Support and Contact
 ===================
 
-* The ``#pimutils`` `IRC channel on Freenode <https://pimutils.org/contact>`_
+* The ``#pimutils`` `IRC channel on Libera.Chat <https://pimutils.org/contact>`_
   might be active, depending on your timezone. Use it for support and general
   (including off-topic) discussion.