message: Add two missing errors to README
diff: @@ -262,6 +262,8 @@ The error nummber corresponds to the following:
  19. `ERROR_SPIN_UP_TIMEOUT`
  20. `ERROR_DRV_FAULT`
  21. `ERROR_NOT_IMPLEMENTED_MOTOR_TYPE`
  +22. `ERROR_ENCODER_CPR_OUT_OF_RANGE`
  +23. `ERROR_DC_BUS_BROWNOUT`
  If you get an error code larger than this, it may be the case that someone added a code and forgot to update the documentation. In that case, please check [MotorControl/low_level.h](MotorControl/low_level.h) for the full enum.
  