Version 0.2.3

• Bump jni-min-helper to 0.3. Threatened by the UB found in wuwbobo2021/android-bluetooth-serial-rs#2.
• check_attached_intent() no longer returns the device if the permission is lost.
• Added default serialport feature which can be turned off (this choice will be removed in 0.3.0, see kevinmehall/nusb#150).