message: move IRC channel to Libera.Chat
diff: @@ -173,9 +173,8 @@ Python modules are loaded through the global module
  ## Further information
  -Please visit https://znc.in/ or #znc on freenode if you still have questions:
  -- [freenode webchat](https://webchat.freenode.net/?nick=znc_....&channels=znc)
  -- [ircs://irc.freenode.net:6697/znc](ircs://irc.freenode.net:6697/znc)
  +Please visit https://znc.in/ or #znc on Libera.Chat if you still have questions:
  +- [ircs://irc.libera.chat:6697/#znc](ircs://irc.libera.chat:6697/#znc)
  You can get the latest development version with git:
  `git clone https://github.com/znc/znc.git --recursive`
  