remove pycql from flask requirements
remove pycql from flask requirements

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