message: Fix binding call in get_battery_channel()
diff: @@ -451,7 +451,7 @@ class BoardShim (object):
  :raises BrainFlowError: If this board has no such data exit code is UNSUPPORTED_BOARD_ERROR
  """
  battery_channel = numpy.zeros (1).astype (numpy.int32)
  - res = BoardControllerDLL.get_instance ().get_package_num_channel (board_id, battery_channel)
  + res = BoardControllerDLL.get_instance ().get_battery_channel (board_id, battery_channel)
  if res != BrainflowExitCodes.STATUS_OK.value:
  raise BrainFlowError ('unable to request info about this board', res)
  return int (battery_channel[0])
  