Update sphinx to 3.0.1

[pyup-bot]

This PR updates Sphinx from 3.0.0 to 3.0.1.

Changelog

3.0.1

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

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

* 7418: std domain: :rst:dir:`term` role becomes case sensitive

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

* 7428: py domain: a reference to class ``None`` emits a nitpicky warning
* 7445: py domain: a return annotation ``None`` in the function signature is
not converted to a hyperlink when using intersphinx
* 7418: std domain: duplication warning for glossary terms is case insensitive
* 7438: C++, fix merging overloaded functions in parallel builds.
* 7422: autodoc: fails with ValueError when using autodoc_mock_imports
* 7435: autodoc: ``autodoc_typehints='description'`` doesn't suppress typehints
in signature for classes/methods
* 7451: autodoc: fails with AttributeError when an object returns non-string
object as a ``__doc__`` member
* 7423: crashed when giving a non-string object to logger
* 7479: html theme: Do not include xmlns attribute with HTML 5 doctype
* 7426: html theme: Escape some links in HTML templates

Links

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