update grammar file to match Cromwell supported WDL version (#95)
update grammar file to match Cromwell supported WDL version (#95)


broadinstitute/wdl,broadinstitute/wdl,openwdl/wdl,broadinstitute/wdl,openwdl/wdl,openwdl/wdl,openwdl/wdl,broadinstitute/wdl