Version 0.2.2

• Fixed support for newest Android versions: check_attached_intent() does not work, PermissionRequest never returns the result of being permitted, both are caused by the bad implementation of PartialEq for DeviceInfo.
• Added UsbSerial trait to prepare for driver implementations of non-CDC serial adapters. It is currently sealed (not object-safe), and suggestions about this trait will be welcome.
• The serial handler can be turned into nusb transfer queues for asynchronous operations, this can be done after serial configuration.