remove column in adonis migration code example

Example: drop column adonisjs migration

down () {
    //Remove Default Value Constraint
    this.alter('mytable', (table) => {
      table.boolean('column1')
      table.boolean('column2')
    })

    //Remove Columns
    this.alter('mytable', (table) => {
      table.dropColumn('column1')
      table.dropColumn('column2')
    })
  }