adding optional tag b/c of default type

Author: SebastienFauque

adafruit_monsterm4sk.py

@@ -41,6 +41,7 @@
 
 try:
     from circuitpython_typing.device_drivers import I2CDeviceDriver
+    from typing import Optional
 except ImportError:
     pass
 
@@ -67,7 +68,7 @@ class MonsterM4sk:
     The right screen is the one USB port directly above it.
     """
 
-    def __init__(self, i2c: I2CDeviceDriver = None):
+    def __init__(self, i2c: Optional[I2CDeviceDriver] = None):
         """
         :param i2c: The I2C bus to use, will try board.I2C()
             if not supplied