Hide the icon when there's undone reminders

[te6-in]

Hi, thank you for this amazing app. This is one of my musts using macOS.

Since macbooks have notches these days, many users want to keep their menu bar as minimal as possible.
I think we can save some space by adding an option to hide the icon when the counter is shown.

Current

If there are any reminders undone:

If the count is 0:

Proposed Implementation

If there are any reminders undone and the option is on:

If the count is 0: