Bump sphinx from 1.7.9 to 1.8.0

[dependabot-preview]

Bumps sphinx from 1.7.9 to 1.8.0.

Changelog

Sourced from sphinx's changelog.

Release 1.8.0 (released Sep 13, 2018)

Dependencies

1.8.0b1

• LaTeX: :confval:latex_use_xindy, if True (default for
  xelatex/lualatex), instructs make latexpdf to use :program:xindy
  for general index. Make sure your LaTeX distribution includes it.
  (refs: #5134)

Incompatible changes

1.8.0b2

• #5282: html theme: refer pygments_style settings of HTML themes
  preferentially
• The URL of download files are changed
• #5127: quickstart: Makefile and make.bat are not overwritten if exists

1.8.0b1

• #5156: the :py:mod:sphinx.ext.graphviz: extension runs dot` in the
  directory of the document being built instead of in the root directory of
  the documentation.
• #4460: extensions which stores any data to environment should return the
  version of its env data structure as metadata. In detail, please see
  :ref:ext-metadata.
• Sphinx expects source parser modules to have supported file formats as
  Parser.supported attribute
• The default value of :confval:epub_author and :confval:epub_publisher are
  changed from 'unknown' to the value of :confval:author. This is same as
  a conf.py file sphinx-build generates.
• The gettext_compact attribute is removed from document.settings
  object. Please use config.gettext_compact instead.
• The processing order on reading phase is changed. smart_quotes, sphinx
  domains, :event:doctree-read event and versioning doctrees are invoked
  earlier than so far. For more details, please read a description of
  :py:meth:.Sphinx.add_transform()
• #4827: All substitution_definition nodes are removed from doctree on
  reading phase
• docutils.conf on $HOME and /etc directories are ignored. Only
  docutils.conf on confdir is refered.
• #789: :samp: role supports to escape curly braces with backslash
• #4811: The files under :confval:html_static_path are excluded from source
  files.
• latex: Use \sphinxcite for citation references instead \hyperref

... (truncated)

Commits

• 16533cf Bump to 1.8.0 final
• 46a1f4e Update message catalogs
• b2b833d Update CHANGES for PR #5403
• 908f3a2 Merge pull request #5403 from jdufresne/unused-content
• caeaea9 Merge pull request #5401 from jdufresne/message
• e6e6d91 Deprecate unused argument, content, from guess_mimetype
• 9d6deec Fix AttributeError in ExtensionError
• cf707ac Revert translations on zh_CN because of broken
• eeba8f3 Update message catalogs (from transifex)
• d1eecb1 Merge branch '1.7' into 1.8
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 446

• 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 444:	0.0%
Covered Lines:	28
Relevant Lines:	28

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💛 - Coveralls