send reset command in destructor

The PPK2 was not reset when the object was deleted.
The PPK2 is reset with the PPK2 RESET command.
This allows a new connection to be established immediately.

Author: rgroh1996

src/ppk2_api/ppk2_api.py

@@ -98,6 +98,9 @@ def __init__(self, port: str, **kwargs):
     def __del__(self):
         """Destructor"""
         try:
+            # reset device
+            self._write_serial((PPK2_Command.RESET,))
+
             if self.ser:
                 self.ser.close()
         except Exception as e: