Remove more at the bottom

Author: rowleya

examples/external_devices_examples/pushbot_light_follower.py

@@ -116,7 +116,7 @@
 start_row = 30
 
 # Last row to consider in any group of pixels (i.e. ignore bright bottom lights)
-end_row = retina_resolution.value.pixels - 30
+end_row = retina_resolution.value.pixels - 40
 
 # Connection weights for this connection list
 w_conn = 0.2