message: fix typo in remove_environmental_noise
diff: @@ -323,7 +323,7 @@ int remove_environmental_noise (double *data, int data_len, int sampling_rate, i
  {
  case NoiseTypes::FIFTY:
  res = perform_bandstop (
  - data, data_len, sampling_rate, 48.0, 62.0, 4, (int)FilterTypes::BUTTERWORTH, 0.0);
  + data, data_len, sampling_rate, 48.0, 52.0, 4, (int)FilterTypes::BUTTERWORTH, 0.0);
  break;
  case NoiseTypes::SIXTY:
  res = perform_bandstop (
  