'MultiCommand' is deprecated and will be removed in Click 9.0

[mtelka]

Testing with click 8.3.0 shows this warning:

=============================== warnings summary ===============================
click_help_colors/core.py:161
  $(@D)/click_help_colors/core.py:161: DeprecationWarning: 'MultiCommand' is deprecated and will be removed in Click 9.0. Use 'Group' instead.
    class HelpColorsMultiCommand(HelpColorsMixin, click.MultiCommand):

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======== 16 passed, 1 warning ========