Update bleach to 3.1.5

[pyup-bot]

This PR updates bleach from 3.1.4 to 3.1.5.

Changelog

3.1.5

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

**Security fixes**

None

**Features**

None

**Bug fixes**

* replace missing ``setuptools`` dependency with ``packaging``. Thank you Benjamin Peterson.

Links

• PyPI: https://pypi.org/project/bleach
• Changelog: https://pyup.io/changelogs/bleach/
• Repo: https://github.com/mozilla/bleach
• Docs: https://pythonhosted.org/bleach/

[codecov]

Codecov Report

Merging #1590 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1590   +/-   ##
=======================================
  Coverage   76.51%   76.51%           
=======================================
  Files         123      123           
  Lines        4564     4564           
  Branches      545      545           
=======================================
  Hits         3492     3492           
  Misses        900      900           
  Partials      172      172           

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