Update sphinx to 2.1.2

[pyup-bot]

This PR updates Sphinx from 2.1.0 to 2.1.2.

Changelog

2.1.2

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

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

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

Deprecated
----------

Features added
--------------

Bugs fixed
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Testing
--------

2.1.1

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

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

* 6447: autodoc: Stop to generate document for undocumented module variables

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

* 6442: LaTeX: admonitions of :rst:dir:`note` type can get separated from
immediately preceding section title by pagebreak
* 6448: autodoc: crashed when autodocumenting classes with ``__slots__ = None``
* 6451: autodoc: generates docs for "optional import"ed modules as variables
* 6452: autosummary: crashed when generating document of properties
* 6455: napoleon: docstrings for properties are not processed
* 6436: napoleon: "Unknown target name" error if variable name ends with
underscore
* 6440: apidoc: missing blank lines between modules

Links

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