update .gitignore
update .gitignore

cr-marcstevens/fplll,fplll/fplll,fplll/fplll,dstehle/fplll,cr-marcstevens/fplll,fplll/fplll,fplll/fplll,dstehle/fplll,cr-marcstevens/fplll,fplll/fplll,dstehle/fplll,cr-marcstevens/fplll