GWP_series_box_template filter

a part of GWP tutorial : https://generatewp.com/group-post-series-custom-taxonomy

add_filter('GWP_series_box_template', function ( $template ){
	return '
		<div id="post-series">
			<div class="series-title">Post Series: <a href="{series_url}" title="View all post in the series">{series_title}</a></div>
			{series_list}
		</div>';
});