Update requests to 2.20.0

[pyup-bot]

This PR updates requests from 2.19.1 to 2.20.0.

Changelog

2.20.0

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

**Bugfixes**

-   Content-Type header parsing is now case-insensitive (e.g.
 charset=utf8 v Charset=utf8).
-   Fixed exception leak where certain redirect urls would raise
 uncaught urllib3 exceptions.
-   Requests removes Authorization header from requests redirected
 from https to http on the same hostname. (CVE-2018-18074)
-   `should_bypass_proxies` now handles URIs without hostnames (e.g.
 files).

**Dependencies**

- Requests now supports urllib3 v1.24.

**Deprecations**

- Requests has officially stopped support for Python 2.6.

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 449

• 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 58.005%

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Totals
Change from base Build 446:	0.0%
Covered Lines:	4717
Relevant Lines:	8132

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💛 - Coveralls