Moved typing related imports into try block

Author: Jason Symons

adafruit_is31fl3741/__init__.py

@@ -27,12 +27,12 @@
 from adafruit_bus_device import i2c_device
 from adafruit_register.i2c_struct import ROUnaryStruct, UnaryStruct
 from adafruit_register.i2c_bit import RWBit
-import busio
 
 try:
     # Used only for typing
     from typing import Optional, Tuple, Union  # pylint: disable=unused-import
     from PIL import Image
+    import busio
 except ImportError:
     pass