post_save listener: only recheck links when url is changed
post_save listener: only recheck links when url is changed

claudep/django-linkcheck,Ixxy-Open-Source/django-linkcheck-old,DjangoAdminHackers/django-linkcheck,claudep/django-linkcheck,Ixxy-Open-Source/django-linkcheck-old,DjangoAdminHackers/django-linkcheck