Bump sphinx from 3.0.4 to 3.1.1 in /requirements

[dependabot-preview]

Bumps sphinx from 3.0.4 to 3.1.1.

Changelog

Sourced from sphinx's changelog.

Release 3.1.1 (released Jun 14, 2020)

Incompatible changes

• #7808: napoleon: a type for attribute are represented as typed field

Features added

• #7807: autodoc: Show detailed warning when type_comment is mismatched with its signature

Bugs fixed

• #7808: autodoc: Warnings raised on variable and attribute type annotations
• #7802: autodoc: EOFError is raised on parallel build
• #7821: autodoc: TypeError is raised for overloaded C-ext function
• #7805: autodoc: an object which descriptors returns is unexpectedly documented
• #7807: autodoc: wrong signature is shown for the function using contextmanager
• #7812: autosummary: generates broken stub files if the target code contains an attribute and module that are same name
• #7808: napoleon: Warnings raised on variable and attribute type annotations
• #7811: sphinx.util.inspect causes circular import problem

Release 3.1.0 (released Jun 08, 2020)

Dependencies

• #7746: mathjax: Update to 2.7.5

Incompatible changes

• #7477: imgconverter: Invoke "magick convert" command by default on Windows

Deprecated

• The first argument for sphinx.ext.autosummary.generate.AutosummaryRenderer has been changed to Sphinx object
• sphinx.ext.autosummary.generate.AutosummaryRenderer takes an object type as an argument
• The ignore argument of sphinx.ext.autodoc.Documenter.get_doc()
• The template_dir argument of sphinx.ext.autosummary.generate. AutosummaryRenderer

Commits

• e7c2949 Bump to 3.1.1 final
• d2cec67 Merge pull request #7831 from tk0miya/7807_contextmanager
• 941e340 Merge branch '3.1.x' into 7807_contextmanager
• b567721 Merge pull request #7829 from tk0miya/7805_retval_of_descriptors
• 6c3db6d Fix #7805: autodoc: an object which descriptors returns is documented
• 02acad6 Merge pull request #7827 from tk0miya/7808_napoleon_nitpicky_warning
• 6eb43ba Merge pull request #7823 from tk0miya/7821_overload_builtin_function
• d77622b Fix #7807: autodoc: wrong signature is shown for the function using contextma...
• b3affa6 Fix autodoc: Show detailed warning when type_comment is mismatched (refs: #7807)
• e983189 Update CHANGES
• Additional commits viewable in compare view

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Superseded by #59.