Update requests to 2.20.1

[pyup-bot]

This PR updates requests from 2.20.0 to 2.20.1.

Changelog

2.20.1

-------------------

**Bugfixes**

- Fixed bug with unintended Authorization header stripping for
redirects using default ports (http/80, https/443).

Links

• PyPI: https://pypi.org/project/requests
• Changelog: https://pyup.io/changelogs/requests/
• Homepage: http://python-requests.org

[coveralls]

Pull Request Test Coverage Report for Build 69

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.166%

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Totals
Change from base Build 66:	0.0%
Covered Lines:	400
Relevant Lines:	434

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💛 - Coveralls