{!! wp_nav_menu([
    'theme_location' => 'primary_menu',
    'menu_class' => 'navigation',
    'container' => false,
    'items_wrap' => '<ul id="%1$s" class="%2$s">%3$s</ul>',
    'menu_id' => 'main-nav',
    'before' => '',
    'after' => '',
    'link_before' => '',
    'link_after' => ''
]) !!}