Markdown-gettext

- [Use polib to compile PO files when gettext isn't available](https://github.com/PhuNH/markdown-gettext/commit/990885869b67b452ce7a2073d9223dd7c0c07252)
- With the new mdit-py-i18n, hard line breaks are supported, and fence parse is no more

**Full Changelog**: https://github.com/PhuNH/markdown-gettext/compare/v0.1.4...v0.2.0

**Full Changelog**: https://github.com/PhuNH/markdown-gettext/compare/v0.1.3...v0.1.4

**Full Changelog**: https://github.com/PhuNH/markdown-gettext/compare/v0.1.2...v0.1.3

Fix the conversion from I18NEntry to POEntry

**Full Changelog**: https://github.com/PhuNH/markdown-gettext/compare/v0.1.1...v0.1.2

Split the library into [mdit-py-i18n](https://github.com/PhuNH/mdit-py-i18n), keep this as a program only.

**Full Changelog**: https://github.com/PhuNH/markdown-gettext/compare/v0.1.0...v0.1.1

Split from [hugo-gettext](https://github.com/PhuNH/hugo-gettext/) and made to fit its scope.

**Full Changelog**: https://github.com/PhuNH/markdown-gettext/commits/v0.1.0