Update setuptools to 53.1.0

[pyup-bot]

This PR updates setuptools from 51.3.3 to 53.1.0.

Changelog

53.1.0

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Changes
^^^^^^^
* 1937: Preserved case-sensitivity of keys in setup.cfg so that entry point names are case-sensitive. Changed sensitivity of configparser. NOTE: Any projects relying on case-insensitivity will need to adapt to accept the original case as published. -- by :user:`melissa-kun-li`
* 2573: Fixed error in uploading a Sphinx doc with the :code:`upload_docs` command. An html builder will be used. 
Note: :code:`upload_docs` is deprecated for PyPi, but is supported for other sites -- by :user:`melissa-kun-li`

53.0.0

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Breaking Changes
^^^^^^^^^^^^^^^^
* 1527: Removed bootstrap script. Now Setuptools requires pip or another pep517-compliant builder such as 'build' to build. Now Setuptools can be installed from Github main branch.

52.0.0

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Breaking Changes
^^^^^^^^^^^^^^^^
* 2537: Remove fallback support for fetch_build_eggs using easy_install. Now pip is required for setup_requires to succeed.
* 2544: Removed 'easy_install' top-level model (runpy entry point) and 'easy_install' console script.
* 2545: Removed support for eggsecutables.

Changes
^^^^^^^
* 2459: Tests now run in parallel via pytest-xdist, completing in about half the time. Special thanks to :user:`webknjaz` for hard work implementing test isolation. To run without parallelization, disable the plugin with ``tox -- -p no:xdist``.

Links

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

[coveralls]

Coverage remained the same at 86.233% when pulling 164a1be on pyup-update-setuptools-51.3.3-to-53.1.0 into 2d84ca7 on master.