Mdformat-admon

Changelog:

- **Breaking**: the plugin is now named "admon" rather than "admonition." This change should only impact test suites ([example migration](https://github.com/KyleKing/mdformat-mkdocs/commit/6a329979e27da47a215607d4e30f61d22e683b89))
- Fixes https://github.com/KyleKing/mdformat-mkdocs/issues/23 when multiple empty newlines exist within a fenced block

**Full Changelog**: https://github.com/KyleKing/mdformat-admon/compare/v2.0.2...v2.0.3

What's Changed

- Improved README, general documentation, and test cases
- Minor internal refactoring

**Full Changelog**: https://github.com/KyleKing/mdformat-admon/compare/v2.0.1...v2.0.2

**Full Changelog**: https://github.com/KyleKing/mdformat-admon/compare/v2.0.0...v2.0.1

- Minor breaking change to import path of internal `mdit_plugins` directory