title: Sequelize, does setting timestamps:true create the createdAt updatedAt columns in the migrations?
body: <p>My migration script in sequelize is not creating the timestamp columns createdAt, updatedAt</p>
  
  <p><code>Error: SequelizeDatabaseError: ER_BAD_FIELD_ERROR: Unknown column 'createdAt' in 'field list'</code></p>
  
  <p>I thought that setting timestamps to true in the migration definition auto-created the columns, am I wrong?</p>
  
  <pre><code>module.exports = {
    up: function (queryInterface, Sequelize) {
      return queryInterface.createTable('User', {
        id: {
          type: Sequelize.INTEGER,
          primaryKey: true,
          autoIncrement: true,
          allowNull: false
        },
        uname: {
          type: Sequelize.STRING(50)
        }
  
      },{
        timestamps: true
      })
  ...
  </code></pre>