fix: Use correct server url

src/main/java/de/fossag/hackatron/Main.java

@@ -6,7 +6,7 @@ public class Main {
 
   public static void main(String[] args) throws IOException {
     HackatronWrapper client = new HackatronWrapper(
-        "hackatron.de",
+        "game.hackatron.de",
         4000,
         new HackatronClient());
     client.run();