[#284] *: Update version and remove the old migration code

Less chances to forget anything in the next release.

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>

netmap/netmap_contract.go

@@ -94,25 +94,6 @@ func _deploy(data interface{}, isUpdate bool) {
 
 	if isUpdate {
 		common.CheckVersion(args.version)
-
-		count := getSnapshotCount(ctx)
-		prefix := []byte(snapshotKeyPrefix)
-		for i := 0; i < count; i++ {
-			key := append(prefix, byte(i))
-			data := storage.Get(ctx, key)
-			if data != nil {
-				nodes := std.Deserialize(data.([]byte)).([]Node)
-				for i := range nodes {
-					// Old structure contains only the first field,
-					// second is implicitly assumed to be Online.
-					nodes[i] = Node{
-						BLOB:  nodes[i].BLOB,
-						State: NodeStateOnline,
-					}
-				}
-				common.SetSerialized(ctx, key, nodes)
-			}
-		}
 		return
 	}