adds typing import to circumvent importing unnecessary libaries at run time - Issue #17.

Author: angerer

adafruit_mcp9600.py

@@ -36,6 +36,8 @@
 from adafruit_register.i2c_bit import RWBit, ROBit
 
 try:
+    # Used only for typing
+    import typing  # pylint: disable=unused-import
     from busio import I2C
 except ImportError:
     pass