Docs for Digit / Colon?

[chmac]

Just discovered that there is a colon, awesome! Poking around trying to figure out how to put it all together. Did I miss docs for that somewhere? Open to adding them? I might whip up a PR if I make enough progress...

[jonathan-meyer]

Sorry I'll need to add some docs. I should probably also put in a test or two. I've learned a lot since I created this widget and it could use some updates.

Thanks for the PR.