message: Update brainflow_boards.json
diff: "ecg_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  "eog_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  "eda_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  - "accel_channels" : [8, 10, 11],
  + "accel_channels" : [9, 10, 11],
  "analog_channels" : [19, 20, 21],
  "other_channels": [12, 13, 14, 15, 16, 17, 18]
  },
  