Add Horizontal Row (<hr>) markdown support


It is fairly common to have the β€œβ€”β€ or β€œ___” commands in Markdown supported tools. If unfamiliar, this would create a full-width horizontal line. It would be great to have this included in Dynalist.

Love what you guys are doing! Great product!


This is a great idea. I have been experimenting with more ways to add more visual indicators to larger outlines. This I think would be useful.