Fix compile

common/src/main/java/me/lucko/luckperms/common/storage/SplitBacking.java

@@ -68,6 +68,11 @@ public class SplitBacking implements Datastore {
         plugin.doSync(r);
     }
 
+    @Override
+    public Datastore force() {
+        return this;
+    }
+
     @Override
     public void init() {
         boolean success = true;