Added default parameter to pass the tests

Author: ryanhz

osdp/_bus.py

@@ -44,7 +44,7 @@ def send_command(self, command: Command):
 		else:
 			log.warning("Device not found with address %s", command.address)
 
-	def add_device(self, address: int, use_crc: bool, use_secure_channel: bool, master_key: bytes) -> Device:
+	def add_device(self, address: int, use_crc: bool, use_secure_channel: bool, master_key: bytes = None) -> Device:
 		found_device = self._configured_devices.get(address)
 		self._configured_devices_lock.acquire()
 		if found_device is not None:

osdp/_device.py

@@ -13,7 +13,7 @@
 
 class Device(object):
 
-	def __init__(self, address: int, use_crc: bool, use_secure_channel: bool, master_key: bytes):
+	def __init__(self, address: int, use_crc: bool, use_secure_channel: bool, master_key: bytes = None):
 		self._use_secure_channel = use_secure_channel
 		self.address = address
 		self.message_control = Control(0, use_crc, use_secure_channel)