text: 
  exports.up = function(knex) {
      return knex.schema.createTable('users', (tbl) => {
          tbl.increments()
          tbl.string('email', 256).notNullable().unique()
          tbl.string('password', 256).notNullable().unique()
      })
  };
  
  exports.down = function(knex) {
    return knex.schema.dropTableIfExists('users')
  };
  