fix OpenAPI vendorSpecificParameters (#755)
fix OpenAPI vendorSpecificParameters (#755)

tomkralidis/pycsw,tomkralidis/pycsw,geopython/pycsw,geopython/pycsw,kalxas/pycsw,tomkralidis/pycsw,geopython/pycsw,kalxas/pycsw,kalxas/pycsw