Update sphinx to 1.7.6

[pyup-bot]

This PR updates sphinx from 1.7.5 to 1.7.6.

Changelog

1.7.6

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

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

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

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

Bugs fixed
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* 5037: LaTeX ``\sphinxupquote{}`` breaks in Russian
* sphinx.testing uses deprecated pytest API; ``Node.get_marker(name)``
* 5016: crashed when recommonmark.AutoStrictify is enabled
* 5022: latex: crashed with docutils package provided by Debian/Ubuntu
* 5009: latex: a label for table is vanished if table does not have a caption
* 5048: crashed with numbered toctree
* 2410: C, render empty argument lists for macros.
* C++, fix lookup of full template specializations with no template arguments.
* 4667: C++, fix assertion on missing references in global scope when using
intersphinx. Thanks to Alan M. Carroll.
* 5019: autodoc: crashed by Form Feed Character
* 5032: autodoc: loses the first staticmethod parameter for old styled classes
* 5036: quickstart: Typing Ctrl-U clears the whole of line
* 5066: html: "relations" sidebar is not shown by default
* 5091: latex: curly braces in index entries are not handled correctly
* 5070: epub: Wrong internal href fragment links
* 5104: apidoc: Interface of ``sphinx.apidoc:main()`` has changed
* 5076: napoleon raises RuntimeError with python 3.7
* 5125: sphinx-build: Interface of ``sphinx:main()`` has changed
* sphinx-build: ``sphinx.cmd.build.main()`` refers ``sys.argv`` instead of given
argument
* 5146: autosummary: warning is emitted when the first line of docstring ends
with literal notation
* autosummary: warnings of autosummary indicates wrong location (refs: 5146)
* 5143: autodoc: crashed on inspecting dict like object which does not support
sorting

Testing
--------

Links

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