Safe onResume override to handle device wake-up, Removed unlocked notification, and formatted README

[fahim-ahmed05]

• Safe onResume override

 local originalResume = self.onResume
    self.onResume = function(self)
        if originalResume then originalResume(self) end
        if not self.locked then
            self:lockScreen()
        end

• Removed unlocked notification
  Adds extra unnecessary 1s delay before I can use the device.

• Formatted README