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fix: v2.7.0rc1

+ Added the support for more `type`s to pass to
  `ColorizingArgumentParser().add_argument(...)`: `tuple` and
  `typing.Required`.
+ Modified the way `Enum`s are handled in the Argument Parser.
+ Handled some `typing._SpecialForm`s.
+ feat: A normal ArgumentGroup can now be required! (Unlike
  MutuallyExclusiveGroup it can have more than 1 option used at the same
  time)