Bump docutils from 0.15.2 to 0.16 (#278)

Bumps [docutils](http://docutils.sourceforge.net/) from 0.15.2 to 0.16.

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -4,7 +4,7 @@ aiohttp==3.6.2
 async-generator==1.10
 attrs==19.3.0
 bandit==1.6.2
-docutils==0.15.2
+docutils==0.16
 flake8-bugbear==19.8.0
 flake8-quotes==2.1.1
 flake8==3.7.9