save the player in the database again when the player leaves the server

src/main/java/net/krakatoa/proxy/listener/PlayerDisconnectListener.java

@@ -50,6 +50,8 @@ public class PlayerDisconnectListener implements Listener {
 
             UpdateOptions options = new UpdateOptions().upsert(true);
 
+            System.out.println("doc: " + document.keySet());
+
             ProxySystem.getInstance().getMongoManager().getPlayers()
                 .updateOne(document, updates, options, (result, t) -> {
                   System.out.println(result == null);