Update markupsafe to 2.0.0

[pyup-bot]

This PR updates MarkupSafe from 1.1.1 to 2.0.0.

Changelog

2.0.0

-------------

Released 2021-05-11

-   Drop Python 2.7, 3.4, and 3.5 support.
-   ``Markup.unescape`` uses :func:`html.unescape` to support HTML5
 character references. :pr:`117`
-   Add type annotations for static typing tools. :pr:`149`

Links

• PyPI: https://pypi.org/project/markupsafe
• Changelog: https://pyup.io/changelogs/markupsafe/
• Homepage: https://palletsprojects.com/p/markupsafe/

[pyup-bot]

Closing this in favor of #101