chore(deps-dev): bump sphinx from 1.8.4 to 1.8.5

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 1.8.4 to 1.8.5.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v1.8.4...v1.8.5)

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

Author: dependabot-support

requirements.txt

@@ -6,7 +6,7 @@ pep8==1.7.1
 pycodestyle==2.5.0
 -e git://github.com/pytest-dev/pytest-cov@master#egg=pytestcov
 six==1.12.0
-Sphinx==1.8.4
+Sphinx==1.8.5
 sphinxcontrib-log-cabinet==1.0.0
 sphinxcontrib-websupport==1.1.0
 pip==19.0.3