update docs with WMS 1.3.0 harvesting support [ci skip]
update docs with WMS 1.3.0 harvesting support [ci skip]

bukun/pycsw,geopython/pycsw,ingenieroariel/pycsw,tomkralidis/pycsw,ricardogsilva/pycsw,tomkralidis/pycsw,ingenieroariel/pycsw,geopython/pycsw,kalxas/pycsw,ricardogsilva/pycsw,tomkralidis/pycsw,kalxas/pycsw,kalxas/pycsw,bukun/pycsw,geopython/pycsw,ricardogsilva/pycsw,bukun/pycsw