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v2.7.0

+ Modified `automatic-release.yml` and `pypi.yml` workflows to check the
  version.
+ Added the support for more `type`s to pass to
  `ColorizingArgumentParser().add_argument(...)`: `typing.Union`, `typing.Optional`,
  `typing.Literal`, `enum.Enum`, `tuple` and `typing.Required`.
+ Modified the way `Enum`s are handled in the Argument Parser.
+ Handled some `typing._SpecialForm`s.
+ A normal ArgumentGroup can now be required! (Unlike MutuallyExclusiveGroup it can
  have more than 1 option used at the same time)
+ `argumentify` now supports async functions as the entry point.