discord link update

Assets/Util/Discord.cs

@@ -2,6 +2,6 @@ using UnityEngine;
 
 public class Discord : MonoBehaviour {
     public void OpenURL() {
-        Application.OpenURL("https://discord.gg/45yymHzf38");
+        Application.OpenURL("https://discord.gg/xMjbUYn6dK");
     }
-}
+}