Update sphinx to 2.2.1

[pyup-bot]

This PR updates Sphinx from 2.2.0 to 2.2.1.

Changelog

2.2.1

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

Dependencies
------------

Incompatible changes
--------------------

Deprecated
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Features added
--------------

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

* 6641: LaTeX: Undefined control sequence ``\sphinxmaketitle``
* 6710: LaTeX not well configured for Greek language as main language

Testing
--------

Links

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

[codecov]

Codecov Report

Merging #1087 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1087   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files          13      13           
  Lines         619     619           
  Branches       12      12           
======================================
  Hits          619     619

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