Mdit-py-hugo

**Full Changelog**: https://github.com/PhuNH/mdit-py-hugo/compare/v0.3.0...v0.3.1

- Attributes after deflist and setext heading can be parsed too.
In case of setext heading, if both title attributes and block ones are present, the title ones overwrite the block ones;
- Block attribute parsing and title one can be enabled/disabled separately;
- Parsed attributes are put into closing tokens too.

**Full Changelog**: https://github.com/PhuNH/mdit-py-hugo/compare/v0.2.0...v0.3.0

Add shortcode plugin to parse shortcodes (5c9ee78f473362c8414294e14b91bb7bced4d028)

Use an inline rule to make it easier to implement. The drawback is that shortcodes written in multiple paragraphs cannot be parsed while still accepted by Hugo. On the bright side, shortcodes anywhere can be parsed.

Other changes
- Improve attribute plugin (115d5976ce142e746c1e9dc7866cbe0f24a81b30): by reusing a function from mdit-py-plugins instead of self-implementing;
- Add copyright and license info.

**Full Changelog**: https://github.com/PhuNH/mdit-py-hugo/compare/v0.1.0...v0.2.0

Add a markdown-it-py plugin for parsing Hugo attributes for blocks and titles (headings).

**Full Changelog**: https://github.com/PhuNH/mdit-py-hugo/commits/v0.1.0