Update setuptools to 42.0.0

[pyup-bot]

This PR updates setuptools from 41.6.0 to 42.0.0.

Changelog

42.0.0

-------

* 1830, 1909: Mark the easy_install script and setuptools command as deprecated, and use `pip <https://pip.pypa.io/en/stable/>`_ when available to fetch/build wheels for missing ``setup_requires``/``tests_require`` requirements, with the following differences in behavior:
* support for ``python_requires``
* better support for wheels (proper handling of priority with respect to PEP 425 tags)
* PEP 517/518 support
* eggs are not supported
* no support for the ``allow_hosts`` easy_install option (``index_url``/``find_links`` are still honored)
* pip environment variables are honored (and take precedence over easy_install options)
* 1898: Removed the "upload" and "register" commands in favor of `twine <https://pypi.org/p/twine>`_.
* 1767: Add support for the ``license_files`` option in ``setup.cfg`` to automatically
include multiple license files in a source distribution.
* 1829: Update handling of wheels compatibility tags:
* add support for manylinux2010
* fix use of removed 'm' ABI flag in Python 3.8 on Windows
* 1861: Fix empty namespace package installation from wheel.
* 1877: Setuptools now exposes a new entry point hook "setuptools.finalize_distribution_options", enabling plugins like `setuptools_scm <https://pypi.org/project/setuptools_scm>`_ to configure options on the distribution at finalization time.

Links

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

[pyup-bot]

Closing this in favor of #398