Mdfy

What's Changed
* Fix recursion error for normal str by argonism in https://github.com/argonism/mdfy/pull/18


**Full Changelog**: https://github.com/argonism/mdfy/compare/v0.6.0...v0.6.1

- Mdfier can accept nested content. - All nested content will be flatterned and no affect on the generated markdown. - Few typehist issue are fixed.

What's Changed
* Add list flatten feature for writing content from mdfier by argonism in https://github.com/argonism/mdfy/pull/6
* Add nested content example to Readme.md by argonism in https://github.com/argonism/mdfy/pull/7
* Fix test typehint by argonism in https://github.com/argonism/mdfy/pull/9
* Remove unnecessary test cases by argonism in https://github.com/argonism/mdfy/pull/17


**Full Changelog**: https://github.com/argonism/mdfy/compare/v0.5.1...v0.6.0

Fix a bug - Garbled characters for Windows: https://github.com/argonism/mdfy/pull/5

Add __all__ for make it easy to import

Add py.typed to follow PEP 561

Modify min python version to 0.3.0