Update webargs to 8.1.0

[pyup-bot]

This PR updates webargs from 8.0.0 to 8.1.0.

Changelog

8.1.0

******************

Bug fixes:

* Fix publishing type hints per `PEP-561 <https://www.python.org/dev/peps/pep-0561/>`_.
(:pr:`650`).
* Add DelimitedTuple to fields.__all__ (:pr:`678`).
* Narrow type of ``argmap`` from ``Mapping`` to ``Dict`` (:pr:`682`).

Other changes:

* Test against Python 3.10 (:pr:`647`).
* Drop support for Python 3.6 (:pr:`673`).
* Address distutils deprecation warning in Python 3.10 (:pr:`652`).
Thanks :user:`kkirsche` for the PR.
* Use postponed evaluation of annotations (:pr:`663`).
Thanks :user:`Isira-Seneviratne` for the PR.
* Pin mypy version in tox (:pr:`674`).
* Improve type annotations for ``__version_info__`` (:pr:`680`).

8.0.1

******************

Bug fixes:

* Fix "``DelimitedList`` deserializes empty string as ``['']``" (:issue:`623`).
Thanks :user:`TTWSchell` for reporting and for the PR.

Other changes:

* New documentation theme with `furo`. Thanks to :user:`pradyunsg` for writing
furo!
* Webargs has a new logo. Thanks to :user:`michaelizergit`! (:issue:`312`)
* Don't build universal wheels. We don't support Python 2 anymore.
(:pr:`632`)
* Make the build reproducible (:pr:`631`).

Links

• PyPI: https://pypi.org/project/webargs
• Changelog: https://pyup.io/changelogs/webargs/
• Repo: https://github.com/marshmallow-code/webargs

[coveralls]

Coverage remained the same at 86.413% when pulling 25c6026 on pyup-update-webargs-8.0.0-to-8.1.0 into 2716a32 on master.

[pyup-bot]

Closing this in favor of #442