code: function _initMigrations() {
    return new Umzug({
      storage: 'sequelize',
      storageOptions: {
        sequelize: this.sequelize,
      },
      migrations: {
        params: [this.sequelize.getQueryInterface(), Sequelize],
        path: path.join(__dirname, 'migrations'),
        pattern: /\.js$/,
      },
    });
  }
docs: @private
  
  Setup migrations