text: exports.up = function(knex) {
      return knex.schema.createTable('user', function(t) {
          t.increments('id').primary()
          t.string('username').notNullable()
          t.string('password').notNullable()
          t.timestamps(false, true)
      })
  }
  
  exports.down = function(knex) {
      return knex.schema.dropTableIfExists('user')
  }