Bump markdown-it-py from 2.0.0 to 2.2.0

Bumps [markdown-it-py](https://github.com/executablebooks/markdown-it-py) from 2.0.0 to 2.2.0.
- [Release notes](https://github.com/executablebooks/markdown-it-py/releases)
- [Changelog](https://github.com/executablebooks/markdown-it-py/blob/master/CHANGELOG.md)
- [Commits](https://github.com/executablebooks/markdown-it-py/compare/v2.0.0...v2.2.0)

---
updated-dependencies:
- dependency-name: markdown-it-py
  dependency-type: direct:production
...

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

requirements.txt

@@ -13,7 +13,7 @@ idna==3.3
 imagesize==1.3.0
 Jinja2==3.0.3
 livereload==2.6.3
-markdown-it-py==2.0.0
+markdown-it-py==2.2.0
 MarkupSafe==2.0.1
 mdit-py-plugins==0.3.0
 mdurl==0.1.0