Edit change count to default to 0 instead of -1

Why was it ever defaulted to -1?

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -201,7 +201,7 @@ public class EditSession extends PassthroughExtent implements AutoCloseable {
 
     private final MutableBlockVector3 mutablebv = new MutableBlockVector3();
 
-    private int changes = -1;
+    private int changes = 0;
     private final BlockBag blockBag;
 
     private final Extent bypassHistory;