Bump sphinx from 2.2.2 to 2.3.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 2.2.2 to 2.3.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v2.2.2...v2.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2019-12-23 08:14:54 +00:00 committed by GitHub
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@ -2,5 +2,5 @@
-r requirements.txt
# documentation generation support
Sphinx==2.2.2
Sphinx==2.3.1
numpydoc==0.9.1