exports.up = function(knex, Promise) {
    return knex.schema.createTable('countries', function(countries) {
      countries.increments();
      countries
        .string('name', 128)
        .notNullable()
        .unique();
    });
  };
  
  exports.down = function(knex, Promise) {
    return knex.schema.dropTableIfExists('countries');
  };