message: Move CANopen heartbeat message
diff: @@ -35,7 +35,6 @@ Be careful that you don't assign too many nodeIDs per PDO group. Four CAN Simpl
  CMD ID | Name | Sender | Signals | Start byte
  --: | :-- | :-- | :-- | :--
  0x000 | CANOpen NMT Message\*\* | Master | - | - | -
  -0x700 | CANOpen Heartbeat Message\*\* | Slave | - | - | -
  0x001 | ODrive Heartbeat Message | Axis | Axis Error<br>Axis Current State | 0<br>4
  0x002 | ODrive Estop Message | Master | - | - | -
  0x003 | Get Motor Error\* | Axis | Motor Error | 0
  @@ -59,6 +58,7 @@ CMD ID | Name | Sender | Signals | Start byte
  0x015 | Get Sensorless Estimates\* | Master | Sensorless Pos Estimate<br>Sensorless Vel Estimate | 0<br>4
  0x016 | Reboot ODrive | Master\*\*\* | |
  0x017 | Get Vbus Voltage | Master\*\*\* | Vbus Voltage | 0
  +0x700 | CANOpen Heartbeat Message\*\* | Slave | - | - | -
  \* Note: These messages are call & response. The Master node sends a message with the RTR bit set, and the axis responds with the same ID and specified payload.
  \*\* Note: These CANOpen messages are reserved to avoid bus collisions with CANOpen devices. They are not used by CAN Simple.
  