Update sphinx to 1.7.8

[pyup-bot]

This PR updates Sphinx from 1.7.7 to 1.7.8.

Changelog

1.7.8

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

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

* The type of ``env.included`` has been changed to dict of set

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

* 5320: intersphinx: crashed if invalid url given
* 5326: manpage: crashed when invalid docname is specified as ``man_pages``
* 5322: autodoc: ``Any`` typehint causes formatting error
* 5327: "document isn't included in any toctree" warning on rebuild with
generated files
* 5335: quickstart: escape sequence has been displayed with MacPorts' python

Links

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

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@4fdbefd). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #249   +/-   ##
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  Coverage          ?   36.65%           
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  Files             ?       30           
  Lines             ?     2971           
  Branches          ?        0           
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  Hits              ?     1089           
  Misses            ?     1882           
  Partials          ?        0

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[pyup-bot]

Closing this in favor of #259