**CHANGES** for PLIB3.UI 0.12.1

:Author:        Peter A. Donis
:Release Date:  02 Jan 2022

Version 0.12.1
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- Update bug fix to correctly handle older PySide2 versions.

Version 0.12
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- Fix bug created by Qt5/PySide2 changing ``QSocketNotifier`` to pass
  a ``QSocketDescriptor`` object to notification handlers (instead of
  an ``int`` representing the socket's ``fileno``).

Version 0.11
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- Initial release, version numbering continued from ``plib3.gui``.
