Bump sphinx from 1.8.5 to 2.0.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 1.8.5 to 2.0.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v1.8.5...v2.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

poetry.lock

@@ -47,7 +47,7 @@ pytest = "^4.3"
 pytest-cov = "^2.6"
 pytest-randomly = "^2.1"
 
-sphinx = "^1.8"
+sphinx = "^2.0"
 sphinx-autodoc-typehints = "^1.6"
 sphinxcontrib-mermaid = "^0.3.1"
 sphinx-typlog-theme = "^0.7.1"