Mention -t flag in README
Mention -t flag in README

HIPERFIT/futhark,ihc/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,mrakgr/futhark,HIPERFIT/futhark,mrakgr/futhark,diku-dk/futhark,CulpaBS/wbBach,ihc/futhark,mrakgr/futhark,ihc/futhark