Update setuptools to 41.0.1

[pyup-bot]

This PR updates setuptools from 41.0.0 to 41.0.1.

Changelog

41.0.1

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* 1671: Fixed issue with the PEP 517 backend that prevented building a wheel when the ``dist/`` directory contained existing ``.whl`` files.
* 1709: In test.paths_on_python_path, avoid adding unnecessary duplicates to the PYTHONPATH.
* 1741: In package_index, now honor "current directory" during a checkout of git and hg repositories under Windows

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 #40