  function setGovernor(address _governor)
    public
    onlyRole(GOVERNOR_ROLE, "Must have timelock role")
  {
    _swapRole(_governor, governor, GOVERNOR_ROLE);
    governor = _governor;
    emit NewGovernor(_governor);
  }
  function setDelay(uint256 _delay)
    public
    onlyRole(GOVERNOR_ROLE, "Must have timelock role")
  {
    require(
      _delay >= 0 && _delay < gracePeriod,
      "Timelock::setDelay: Delay must not be greater equal to zero and less than gracePeriod"
    );
    delay = _delay;

    emit NewDelay(delay);
  }
