Only print header in CSV if > 1 fields
Only print header in CSV if > 1 fields

Fixes #90

willscott/zmap,shakenetwork/zmap,3L3N4/zmap,cicku/zmap,zmap/zmap,shakenetwork/zmap,BobuSumisu/zmap,KeelanArrendale/zmap,cicku/zmap,tdi/zmap,KeelanArrendale/zmap,potatozhao/zmap,BobuSumisu/zmap,potatozhao/zmap,scarito/zmap-android,coolacid/zmap,unixfreaxjp/zmap,tdi/zmap,cicku/zmap,scarito/zmap,djeraseit/zmap,cicku/zmap,KeelanArrendale/zmap,eacha/zmap,zhuyue1314/zmap,coolacid/zmap,scarito/zmap-android,zhuyue1314/zmap,zhuyue1314/zmap,unixfreaxjp/zmap,BobuSumisu/zmap,scarito/zmap,zmap/zmap,eacha/zmap,scarito/zmap,unixfreaxjp/zmap,shakenetwork/zmap,tdi/zmap,eacha/zmap,3L3N4/zmap,djeraseit/zmap,willscott/zmap,eacha/zmap,3L3N4/zmap,tdi/zmap,willscott/zmap,coolacid/zmap,scarito/zmap,shakenetwork/zmap,willscott/zmap,3L3N4/zmap,djeraseit/zmap,scarito/zmap-android,willscott/zmap,eacha/zmap,tdi/zmap,cicku/zmap,djeraseit/zmap,3L3N4/zmap,potatozhao/zmap,coolacid/zmap,zmap/zmap,djeraseit/zmap,scarito/zmap-android,BobuSumisu/zmap,scarito/zmap,potatozhao/zmap,shakenetwork/zmap,zhuyue1314/zmap,coolacid/zmap,potatozhao/zmap,BobuSumisu/zmap,zhuyue1314/zmap,KeelanArrendale/zmap,KeelanArrendale/zmap,unixfreaxjp/zmap,unixfreaxjp/zmap