[DRAFT] Version 1.0 Update Notification

First draft of update notification for 1.0.

Since we can't control the update notification dialog like we wanted to -- The first item in the new features list is a note that this is our 1.0

Let me know what you want changed.
I'd mention the feature (overriding shortcuts) first, then the mechanism (a json file).

"Key bindings for default and extensions shortcuts can be overridden in a user JSON file."