text: exports.up = ( knex, Promise ) => (
    Promise.all([
      knex.schema.createTable( 'comentarios', table => {
        table.increments('id').primary().unsigned()
        table.string('nombre')
        table.string('cuerpo')
        table.integer('curso_id').unsigned()
      })
    ])
  )
  
  exports.down = ( knex, Promise ) => {
    Promise.all([
      knex.schema.dropTable('comentarios')
    ])
  }
  