Jaraco.stream

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Rely on PEP 420 for namespace packages.

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Refresh package metadata.

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Require Python 3.6 or later.

Adopt black for code style and other updates from jaraco/skeleton.

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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 ``jaraco.stream.Tee`` from jaraco.util 11.

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Refresh packaging.