Bump restructuredtext-lint from 1.3.0 to 1.3.1 (#272)

Bumps [restructuredtext-lint](https://github.com/twolfson/restructuredtext-lint) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/twolfson/restructuredtext-lint/releases)
- [Changelog](https://github.com/twolfson/restructuredtext-lint/blob/master/CHANGELOG.rst)
- [Commits](twolfson/restructuredtext-lint@1.3.0...1.3.1)

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

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

requirements-dev.txt

@@ -1,7 +1,7 @@
 setuptools==47.1.1
 wheel==0.34.2
 twine==3.1.1
-restructuredtext_lint==1.3.0
+restructuredtext_lint==1.3.1
 unittest-xml-reporting==3.0.2
 sphinx==3.0.4
 sphinx-rtd-theme==0.4.3