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 ---------- Features added -------------- Bugs fixed ---------- * 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/

[coveralls]

Pull Request Test Coverage Report for Build 867

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.503%

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Totals
Change from base Build 863:	0.0%
Covered Lines:	2202
Relevant Lines:	2213

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #204