Update zipp to 3.8.1

[pyup-bot]

This PR updates zipp from 3.2.0 to 3.8.1.

Changelog

3.8.1

======

Refreshed packaging.

Enrolled with Tidelift.

3.8.0

======

Removed compatibility code.

3.7.0

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Require Python 3.7 or later.

3.6.0

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78: Only ``Path`` is exposed in the public API.

3.5.1

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77: Remove news file intended only for CPython.

3.5.0

======

74 and bpo-44095: Added ``.suffix``, ``.suffixes``,
and ``.stem`` properties.

3.4.2

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Refresh package metadata.

3.4.1

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Refresh packaging.

3.4.0

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68 and bpo-42090: ``Path.joinpath`` now takes arbitrary
positional arguments and no longer accepts ``add`` as a
keyword argument.

3.3.2

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Updated project metadata including badges.

3.3.1

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bpo-42043: Add tests capturing subclassing requirements.

3.3.0

======

9: ``Path`` objects now expose a ``.filename`` attribute
and rely on that to resolve ``.name`` and ``.parent`` when
the ``Path`` object is at the root of the zipfile.

Links

• PyPI: https://pypi.org/project/zipp
• Changelog: https://pyup.io/changelogs/zipp/
• Repo: https://github.com/jaraco/zipp

[pyup-bot]

Closing this in favor of #205