Cassio: modify taxonomies capabilities

<?php

add_filter( 'register_taxonomy_args', 'modify_arts_portfolio_category_args', 10, 2 );
function modify_arts_portfolio_category_args( $args, $taxonomy ) {
  if ( 'arts_portfolio_category' === $taxonomy ) {
    $args['hierarchical'] = true;
    $args['has_archive'] = true;
  }

  return $args;
}