IRC has moved to Libera Chat a while ago

Signed-off-by: falkTX <falktx@falktx.com>

README.rst

@@ -36,5 +36,5 @@ and robust system.
     mode usually result in fewer (less audible) audio glitches in a loaded
     system.
 
-For further information, see the JACK `homepage <https://jackaudio.org/>`_ and `wiki <https://github.com/jackaudio/jackaudio.github.com/wiki>`_. There are also the #jack and #lad chat channels on `freenode IRC <https://freenode.net>`_.
+For further information, see the JACK `homepage <https://jackaudio.org/>`_ and `wiki <https://github.com/jackaudio/jackaudio.github.com/wiki>`_. There are also the #jack and #lad chat channels on `Libera Chat IRC <https://web.libera.chat/#jack>`_.