message: add shardid to debug heartbeat
diff: @@ -69,7 +69,7 @@ async function sendConstantHeartbeats(
  shardSocket.send(
  JSON.stringify({ op: GatewayOpcode.Heartbeat, d: previousSequenceNumber }),
  );
  - postDebug({ type: 'heartbeat', data: { interval, previousSequenceNumber }})
  + postDebug({ type: 'heartbeat', data: { interval, previousSequenceNumber, shardID }})
  sendConstantHeartbeats(interval);
  }
  