Jaraco.collections

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Refreshed packaging. Dropped dependency on six.

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Require Python 3.6 or later.

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Added ``pop_all`` function.

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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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Fix DeprecationWarnings when referencing abstract base
classes from collections module.

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Refresh package metadata.