Bump flake8-markdown from 0.2.0 to 0.3.0 (#57)

Bumps [flake8-markdown](https://github.com/johnfraney/flake8-markdown) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/johnfraney/flake8-markdown/releases)
- [Commits](johnfraney/flake8-markdown@v0.2.0...v0.3.0)

---
updated-dependencies:
- dependency-name: flake8-markdown
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -52,7 +52,7 @@ flake8-bugbear = "^21.9.2"
 flake8-builtins = "^1.5.3"
 flake8-comprehensions = "^3.7.0"
 flake8-eradicate = "^1.1.0"
-flake8-markdown = "^0.2.0"
+flake8-markdown = "^0.3.0"
 darglint = "^1.8.1"
 safety = "^1.10.3"
 codespell = "^2.1.0"