reference format in README
reference format in README

pfasante/fplll,gbonnoron/fplll,fplll/fplll,fplll/fplll,dstehle/fplll,fplll/fplll,gbonnoron/fplll,dstehle/fplll,dstehle/fplll,cr-marcstevens/fplll,cr-marcstevens/fplll,shi-bai/fplll,fplll/fplll,blowfish880/fplll,pfasante/fplll,blowfish880/fplll,cr-marcstevens/fplll,shi-bai/fplll,cr-marcstevens/fplll,GottfriedHerold/fplll,GottfriedHerold/fplll,pfasante/fplll,shi-bai/fplll,GottfriedHerold/fplll,blowfish880/fplll,shi-bai/fplll,fplll/fplll,gbonnoron/fplll