Update urllib3 to 1.25.4

[pyup-bot]

This PR updates urllib3 from 1.25.3 to 1.25.4.

Changelog

1.25.4

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

* Propagate Retry-After header settings to subsequent retries. (Pull 1607)

* Fix edge case where Retry-After header was still respected even when
explicitly opted out of. (Pull 1607)

* Remove dependency on ``rfc3986`` for URL parsing.

* Fix issue where URLs containing invalid characters within ``Url.auth`` would
raise an exception instead of percent-encoding those characters.

* Add support for ``HTTPResponse.auto_close = False`` which makes HTTP responses
work well with BufferedReaders and other ``io`` module features. (Pull 1652)

* Percent-encode invalid characters in URL for ``HTTPConnectionPool.request()`` (Pull 1673)

Links

• PyPI: https://pypi.org/project/urllib3
• Changelog: https://pyup.io/changelogs/urllib3/
• Docs: https://urllib3.readthedocs.io/

[codecov-io]

Codecov Report

Merging #49 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files           5        5           
  Lines         247      247           
=======================================
  Hits          193      193           
  Misses         54       54

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[pyup-bot]

Closing this in favor of #50