Changed format of reverse range operator
Changed format of reverse range operator

ecerney/CollectionViewWaterfallLayout,ymkim50/CollectionViewWaterfallLayout,rlam3/CollectionViewWaterfallLayout,SummerHanada/CollectionViewWaterfallLayout,rlam3/CollectionViewWaterfallLayout,ymkim50/CollectionViewWaterfallLayout,ecerney/CollectionViewWaterfallLayout,patelmayank/CollectionViewWaterfallLayout,sairamkotha/CollectionViewWaterfallLayout,patelmayank/CollectionViewWaterfallLayout,SummerHanada/CollectionViewWaterfallLayout,sairamkotha/CollectionViewWaterfallLayout