Bump docutils from 0.16 to 0.18 (#385)

Bumps [docutils](http://docutils.sourceforge.net/) from 0.16 to 0.18.

---
updated-dependencies:
- dependency-name: docutils
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -9,6 +9,6 @@ pytest-pylint==0.18.0
 pytest-sugar==0.9.4
 flake8==4.0.1
 selenium==4.0.0
-docutils==0.16
+docutils==0.18
 pygments==2.10.0
 -e .