I hope I didn't break firmware upgrades on some Mi 1 models
other than mine (my hardware revision is 2).
Upgrades for Mi 1S are currently disabled, we need some brave
souls who can help us test this.
Closes#173
Also see: #169
The notfification APIs now use NotificationSpec as their only parameter, which
contains all information (required and optional ones).
We no longer have separate methods and actions for SMS/EMAIL/GENERIC anymore.
The type of notification is important now, not how we received them technically.