title: Sequelize error when using $notIn to prevent string based operators
body: <p>I'm in Sequelize 5.21.8 version, trying use a no string based operators that are now deprecated.
  But I'm getting this:</p>
  
  <p>It's working fine (with string based):
  where: {id_ativo:  { [Op.notIn] : arr } </p>
  
  <p>It's NOT working:
  where: {id_ativo:  { $notIn : arr } </p>
  
  <p>What am I doing wrong?</p>