@Override
  public String toString() {
    return new StringJoiner(", ", RoundChangeCertificate.class.getSimpleName() + "[", "]")
        .add("roundChangePayloads=" + roundChangePayloads)
        .toString();
  }
Build round change certificate.

@return the round change certificate
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/payload/RoundChangeCertificate.java