message: modify ERC721 withdrawExitMany
diff: @@ -251,14 +251,16 @@ export class ERC721 extends POSToken {
  this.checkForRoot("withdrawExitMany");
  - return this.exitUtil.buildPayloadForExit(
  + return this.exitUtil.buildMultiplePayloadsForExit(
  burnTransactionHash,
  Log_Event_Signature.Erc721BatchTransfer,
  false
  - ).then(payload => {
  - return this.rootChainManager.exit(
  + ).then(payloads => {
  + for (const payload of payloads) {
  + this.rootChainManager.exit(
  payload, option
  );
  + }
  });
  }
  