Update mysqlclient to 1.4.5

[pyup-bot]

This PR updates mysqlclient from 1.4.4 to 1.4.5.

Changelog

1.4.5

======================

Release: 2019-11-06

* The ``auth_plugin`` option is added. (389)


======================

Links

• PyPI: https://pypi.org/project/mysqlclient
• Changelog: https://pyup.io/changelogs/mysqlclient/
• Repo: https://github.com/PyMySQL/mysqlclient-python

[codecov-io]

Codecov Report

Merging #1201 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1201   +/-   ##
=======================================
  Coverage   74.37%   74.37%           
=======================================
  Files         119      119           
  Lines        4846     4846           
  Branches      602      602           
=======================================
  Hits         3604     3604           
+ Misses       1031     1030    -1     
- Partials      211      212    +1

Impacted Files	Coverage Δ
tcms/core/history.py	90.69% <0%> (ø)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 4810

• 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 74.757%

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Totals
Change from base Build 4805:	0.0%
Covered Lines:	3815
Relevant Lines:	4846

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💛 - Coveralls