Update setuptools to 39.2.0

[pyup-bot]

This PR updates setuptools from 39.1.0 to 39.2.0.

Changelog

39.2.0

-------

* 1359: Support using "file:" to load a PEP 440-compliant package version from
a text file.
* 1360: Fixed issue with a mismatch between the name of the package and the
name of the .dist-info file in wheel files
* 1365: Take the package_dir option into account when loading the version from
a module attribute.
* 1353: Added coverage badge to README.
* 1356: Made small fixes to the developer guide documentation.
* 1357: Fixed warnings in documentation builds and started enforcing that the
docs build without warnings in tox.
* 1376: Updated release process docs.
* 1343: The ``setuptools`` specific ``long_description_content_type``,
``project_urls`` and ``provides_extras`` fields are now set consistently
after any ``distutils`` ``setup_keywords`` calls, allowing them to override
values.
* 1352: Added ``tox`` environment for documentation builds.
* 1354: Added ``towncrier`` for changelog managment.
* 1355: Add PR template.
* 1368: Fixed tests which failed without network connectivity.
* 1369: Added unit tests for PEP 425 compatibility tags support.
* 1372: Stop testing Python 3.3 in Travis CI, now that the latest version of
``wheel`` no longer installs on it.

Links

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

[njsmith]

Closing/opening to rebuild after merging #200