Update sphinx to 3.5.2

[pyup-bot]

This PR updates sphinx from 3.5.1 to 3.5.2.

Changelog

3.5.2

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

Bugs fixed
----------

* 8943: i18n: Crashed by broken translation messages in ES, EL and HR
* 8936: LaTeX: A custom LaTeX builder fails with unknown node error
* 8952: Exceptions raised in a Directive cause parallel builds to hang

Links

• PyPI: https://pypi.org/project/sphinx
• Changelog: https://pyup.io/changelogs/sphinx/
• Homepage: http://sphinx-doc.org/

[codecov]

Codecov Report

Merging #199 (e0a110d) into master (f66cff9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #199   +/-   ##
=======================================
  Coverage   26.30%   26.30%           
=======================================
  Files          15       15           
  Lines        4409     4409           
=======================================
  Hits         1160     1160           
  Misses       3249     3249           

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[YourLocalBlake]

bors try

[bors]

try

Build succeeded:

• codecov/patch
• pykoala.koala
• codecov/project

[YourLocalBlake]

bors r+

[bors]

Build succeeded:

• codecov/patch
• codecov/project
• pykoala.koala

[YourLocalBlake]

I didn't have github reset the checks, hence, why it thinks one failed. Pylint was already upgraded to 2.7.0 the time of merging.