Update sphinx to 2.0.1

[pyup-bot]

This PR updates sphinx from 2.0.0 to 2.0.1.

Changelog

2.0.1

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

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

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

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

Bugs fixed
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* LaTeX: some system labels are not translated
* RemovedInSphinx30Warning is marked as pending
* deprecation warnings are not emitted

- sphinx.application.CONFIG_FILENAME
- sphinx.builders.htmlhelp
- :confval:`viewcode_import`

* 6208: C++, properly parse full xrefs that happen to have a short xref as prefix.
* 6220, 6225: napoleon: AttributeError is raised for raised section having
references
* 6245: circular import error on importing SerializingHTMLBuilder
* 6243: LaTeX: 'releasename' setting for latex_elements is ignored
* 6244: html: Search function is broken with 3rd party themes
* 6263: html: HTML5Translator crashed with invalid field node
* 6262: html theme: The style of field lists has changed in bizstyle theme

Testing
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Links

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