Update sphinx to 1.8.0

[pyup-bot]

This PR updates sphinx from 1.7.9 to 1.8.0.

Changelog

1.8.0

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

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

1.8.0b2

* html: search box overrides to other elements if scrolled
* i18n: warnings for translation catalogs have wrong line numbers (refs: 5321)
* 5325: latex: cross references has been broken by multiply labeled objects
* C++, fixes for symbol addition and lookup. Lookup should no longer break
in partial builds. See also 5337.
* 5348: download reference to remote file is not displayed
* 5282: html theme: ``pygments_style`` of theme was overrided by ``conf.py``
by default
* 4379: toctree shows confusible warning when document is excluded
* 2401: autodoc: ``:members:`` causes ``:special-members:`` not to be shown
* autodoc: ImportError is replaced by AttributeError for deeper module
* 2720, 4034: Incorrect links with ``:download:``, duplicate names, and
parallel builds
* 5290: autodoc: failed to analyze source code in egg package
* 5399: Sphinx crashes if unknown po file exists

1.8.0b1

* 5083: Fix wrong make.bat option for internationalization.
* 5115: napoleon: add admonitions added by 4613 to the docs.

1.7.10

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

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

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

Deprecated
----------

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

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

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 197

• 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 100.0%

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Totals
Change from base Build 192:	0.0%
Covered Lines:	693
Relevant Lines:	693

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💛 - Coveralls