[x] Add reminderID to todo item e004a6ff294b0f19c8114387d7f4c15f71cac6ee
[x] Delete corresponding reminder when todo is done 862424e
[ ] Automatically round trip: find all todos with reminders, check corresponding reminder for completion, if completed, complete the todo and delete the reminder.
Implement a command such as
todo.sh remind fetch
that will read your completed iOS reminders and mark their matching todos as done.