Gouge

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* Replace ``blessings`` with ``colorama``. This will make colors work on
Windows as well.

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* Add type-hints & fix minor typing bugs
* Add ``gouge.__version__`` attribute

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* Added :py:class:`gouge.filters.ShiftingFilter`.
* :py:meth:`gouge.colourcli.Simple.basicConfig` now returns a list of modified
handlers.