Bump sphinx from 1.8.3 to 1.8.4 (#11)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 1.8.3 to 1.8.4.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v1.8.3...v1.8.4)

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

requirementsDocs.txt

@@ -1,4 +1,4 @@
-sphinx==1.8.3
+sphinx==1.8.4
 sphinxcontrib-plantuml==0.14
 sphinxcontrib-ansibleautodoc==0.0.5
 sphinx_rtd_theme==0.4.2