adafruit#56 remove dead import

Author: matt-land

adafruit_imageload/bmp/indexed.py

@@ -17,7 +17,7 @@
 import sys
 
 try:
-    from typing import Tuple, Optional, List
+    from typing import Tuple, Optional
     from displayio import Palette, Bitmap
     from io import BufferedReader
     from ..displayio_types import Palette_Constructor, Bitmap_Constructor