Update sphinx to 1.5.3

[pyup-bot]

There's a new version of Sphinx available.
You are currently using 1.5.1. I have updated it to 1.5.3

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

Changelog

1.5.3

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

Features added

• Support requests-2.0.0 (experimental) (refs: 3367)
• (latex) PDF page margin dimensions may be customized (refs: 3387)
• literalinclude directive allows combination of :pyobject: and
  :lines: options (refs: 3416)
• 3400: make-mode doesn't use subprocess on building docs

Bugs fixed

• 3370: the caption of code-block is not picked up for translation
• LaTeX: :confval:release is not escaped (refs: 3362)
• 3364: sphinx-quickstart prompts overflow on Console with 80 chars width
• since 1.5, PDF's TOC and bookmarks lack an entry for general Index
  (refs: 3383)
• 3392: 'releasename' in :confval:latex_elements is not working
• 3356: Page layout for Japanese 'manual' docclass has a shorter text area
• 3394: When 'pointsize' is not 10pt, Japanese 'manual' document
  gets wrong PDF page dimensions
• 3399: quickstart: conf.py was not overwritten by template
• 3366: option directive does not allow punctuations
• 3410: return code in :confval:release breaks html search
• 3427: autodoc: memory addresses are not stripped on Windows
• 3428: xetex build tests fail due to fontspec v2.6 defining \strong
• 3349: Result of IndexBuilder.load() is broken
• 3450: &nbsp is appeared in EPUB docs
• 3418: Search button is misaligned in nature and pyramid theme
• 3421: Could not translate a caption of tables

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)
• Fix parselinenos() could not parse left half open range (cf. "-4")

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

Happy merging! 🤖