Bump docutils from 0.14 to 0.15

Bumps [docutils](http://docutils.sourceforge.net/

) from 0.14 to 0.15.
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements-dev.txt

@@ -9,6 +9,6 @@ pytest-pylint==0.14.0
 pytest-sugar==0.9.2
 flake8==3.7.8
 selenium==3.141.0
-docutils==0.14
+docutils==0.15
 pygments==2.4.2
 -e .