Jaraco.ui

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Features
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- Add main module.

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Use PEP 420 for namespace.

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Refreshed packaging.

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Require Python 3.6 or later.

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Switch to `pkgutil namespace technique
<https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages>`_
for the ``jaraco`` namespace.

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Added ``cmdline.Extend``, an ``argparse.Action`` for use
when nargs is used.