Update requests to 2.26.0

[pyup-bot]

This PR updates requests from 2.25.1 to 2.26.0.

Changelog

2.26.0

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

**Improvements**

- Requests now supports Brotli compression, if either the `brotli` or
`brotlicffi` package is installed. (5783)

- `Session.send` now correctly resolves proxy configurations from both
the Session and Request. Behavior now matches `Session.request`. (5681)

**Bugfixes**

- Fixed a race condition in zip extraction when using Requests in parallel
from zip archive. (5707)

**Dependencies**

- Instead of `chardet`, use the MIT-licensed `charset_normalizer` for Python3
to remove license ambiguity for projects bundling requests. If `chardet`
is already installed on your machine it will be used instead of `charset_normalizer`
to keep backwards compatibility. (5797)

You can also install `chardet` while installing requests by
specifying `[use_chardet_on_py3]` extra as follows:

 shell
 pip install "requests[use_chardet_on_py3]"
 

Python2 still depends upon the `chardet` module.

- Requests now supports `idna` 3.x on Python 3. `idna` 2.x will continue to
be used on Python 2 installations. (5711)

**Deprecations**

- The `requests[security]` extra has been converted to a no-op install.
PyOpenSSL is no longer the recommended secure option for Requests. (5867)

- Requests has officially dropped support for Python 3.5. (5867)

Links

• PyPI: https://pypi.org/project/requests
• Changelog: https://pyup.io/changelogs/requests/
• Docs: https://requests.readthedocs.io

[coveralls]

Coverage remained the same at 86.413% when pulling 17cc993 on pyup-update-requests-2.25.1-to-2.26.0 into 2716a32 on master.