Merge pull request #3 from d2g/patch-1

Update README.md example code from d2g.

README.md

@@ -186,7 +186,7 @@ Examples
     thisIsNil, err := c.Get([]byte("the-apollo-15-moon-buggy"))
 
     // Iterate through items.
-    c.VisitItemsAscend([]byte("ford"), func(i *gkvlite.Item) bool {
+    c.VisitItemsAscend([]byte("ford"), true, func(i *gkvlite.Item) bool {
         // This visitor callback will be invoked with every item
         // with key "ford" and onwards, in key-sorted order.
         // So: "mercedes", "tesla" are visited, in that ascending order,
@@ -203,7 +203,7 @@ Examples
     // The snapshot won't see modifications against the original Store.
     c.Delete([]byte("mercedes"))
     mercedesIsNil, err := c.Get([]byte("mercedes"))
-    mercedesPriceFromSnapshot, err := snapCars.Get([]bytes("mercedes"))
+    mercedesPriceFromSnapshot, err := snapCars.Get([]byte("mercedes"))
 
     // Persist all the changes to disk.
     s.Flush()