Update sphinx to 1.5.2

[pyup-bot]

There's a new version of sphinx available.
You are currently using 1.5.1. I have updated it to 1.5.2

These links might come in handy: PyPI | Changelog | Homepage

Changelog

1.5.2

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

Incompatible changes

• Dependency requirement updates: requests 2.4.0 or above (refs: 3268, 3310)

Features added

• 3241: emit latex warning if buggy titlesec (ref 3210)
• 3194: Refer the $MAKE environment variable to determine make command
• Emit warning for nested numbered toctrees (refs: 3142)
• 978: intersphinx_mapping also allows a list as a parameter
• 3340: (LaTeX) long lines in :dudir:parsed-literal are wrapped like in
  :rst:dir:code-block, inline math and footnotes are fully functional.

Bugs fixed

• 3246: xapian search adapter crashes
• 3253: In Py2 environment, building another locale with a non-captioned
  toctree produces None captions
• 185: References to section title including raw node has broken
• 3255: In Py3.4 environment, autodoc doesn't support documentation for
  attributes of Enum class correctly.
• 3261: latex_use_parts makes sphinx crash
• The warning type misc.highlighting_failure does not work
• 3294: add_latex_package() make crashes non-LaTeX builders
• The caption of table are rendered as invalid HTML (refs: 3287)
• 3268: Sphinx crashes with requests package from Debian jessie
• 3284: Sphinx crashes on parallel build with an extension which raises
  unserializable exception
• 3315: Bibliography crashes on latex build with docclass 'memoir'
• 3328: Could not refer rubric implicitly
• 3329: emit warnings if po file is invalid and can't read it. Also writing mo too
• 3337: Ugly rendering of definition list term's classifier
• 3335: gettext does not extract field_name of a field in a field_list
• 2952: C++, fix refs to operator() functions.
• Fix Unicode super- and subscript digits in :rst:dir:code-block and
  parsed-literal LaTeX output (ref 3342)
• LaTeX writer: leave " character inside parsed-literal as is (ref 3341)
• 3234: intersphinx failed for encoded inventories
• 3158: too much space after captions in PDF output
• 3317: An URL in parsed-literal contents gets wrongly rendered in PDF if
  with hyphen
• LaTeX crash if the filename of an image inserted in parsed-literal
  via a substitution contains an hyphen (ref 3340)
• LaTeX rendering of inserted footnotes in parsed-literal is wrong (ref 3340)
• Inline math in parsed-literal is not rendered well by LaTeX (ref 3340)
• 3308: Parsed-literals don't wrap very long lines with pdf builder (ref 3340)
• 3295: Could not import extension sphinx.builders.linkcheck
• 3285: autosummary: asterisks are escaped twice
• LaTeX, pass dvipdfm option to geometry package for Japanese documents (ref 3363)

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[codecov-io]

Current coverage is 78.74% (diff: 100%)

Merging #23 into master will not change coverage

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