Bump micromark-extension-gfm from 1.0.0 to 2.0.1 (#282)

Bump micromark-extension-gfm from 1.0.0 to 2.0.1 (#282)

Bumps [micromark-extension-gfm](https://github.com/micromark/micromark-extension-gfm) from 1.0.0 to 2.0.1.
- [Release notes](https://github.com/micromark/micromark-extension-gfm/releases)
- [Commits](https://github.com/micromark/micromark-extension-gfm/compare/1.0.0...2.0.1)

---
updated-dependencies:
- dependency-name: micromark-extension-gfm
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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