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
----------

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

@@           Coverage Diff           @@
##           master     #728   +/-   ##
=======================================
  Coverage   97.08%   97.08%           
=======================================
  Files          54       54           
  Lines        2742     2742           
=======================================
  Hits         2662     2662           
  Misses         80       80

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b330895...958d475. Read the comment docs.