Feature request: tasklists

[vlajna95]

This is related to the Markdown parser, I guess. Is it possible to add a parser which allows tasklists?

• [x] PHP Markdown Extra
• [x] Multimarkdown
• [x] Parsedown
• [x] Parsedown Extra
• [ ] - [ ] Something which supports this type of lists 😀

And in Markdown, the list would be...

- [x] PHP Markdown Extra 
- [x] Multimarkdown 
- [x] Parsedown 
- [x] Parsedown Extra 
- [ ] - [ ] Something which supports this type of lists 😀