Update setuptools to 40.0.0

[pyup-bot]

This PR updates setuptools from 39.2.0 to 40.0.0.

Changelog

40.0.0

-------
* 1342: Drop support for Python 3.3.
* 1366: In package_index, fixed handling of encoded entities in URLs.
* 1383: In pkg_resources VendorImporter, avoid removing packages imported from the root.
* 1379: Minor doc fixes after actually using the new release process.
* 1385: Removed section on non-package data files.
* 1403: Fix developer's guide.
* 1404: Fix PEP 518 configuration: set build requirements in ``pyproject.toml`` to ``["wheel"]``.

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 77.8% when pulling b2f4543 on pyup-update-setuptools-39.2.0-to-40.0.0 into 53ca6a3 on master.