update perseus plugin
update perseus plugin

indirectlylit/kolibri,mrpau/kolibri,indirectlylit/kolibri,lyw07/kolibri,lyw07/kolibri,learningequality/kolibri,mrpau/kolibri,learningequality/kolibri,lyw07/kolibri,lyw07/kolibri,mrpau/kolibri,learningequality/kolibri,indirectlylit/kolibri,mrpau/kolibri,learningequality/kolibri,indirectlylit/kolibri