message: add eeg_names for openbci
diff: "timestamp_channel" : 22,
  "num_rows" : 23,
  "eeg_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  + "eeg_names" : "Fp1,Fp2,C3,C4,P7,P8,O1,O2",
  "emg_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  "ecg_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  "eog_channels" : [1, 2, 3, 4, 5, 6, 7, 8],
  "timestamp_channel" : 30,
  "num_rows" : 31,
  "eeg_channels" : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16],
  + "eeg_names" : "Fp1,Fp2,C3,C4,P7,P8,O1,O2,F7,F8,F3,F4,T7,T8,P3,P4",
  "emg_channels" : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16],
  "ecg_channels" : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16],
  "eog_channels" : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16],
  