Try this
<?php echo get_the_term_list($post->ID, 'skills', '<h5>Project Role</h5><ul><li> ', '</li><li>', '</li></ul>' ); ?>
Try this
<?php echo get_the_term_list($post->ID, 'skills', '<h5>Project Role</h5><ul><li> ', '</li><li>', '</li></ul>' ); ?>