text: 
  exports.up = function(knex, Promise) {
    return knex.schema.createTable('book', (table) => {
      table.increments()
      table.text('name').notNullable()
      table.text('icon')
      table.boolean('public').defaultTo(false)
    })
  }
  
  exports.down = function(knex, Promise) {
    return knex.schema.dropTableIfExists('book')
  }
  