Use main thread for shutdown deletion so it completes in time

src/main/java/net/limework/automaticlogdeleter/AutomaticLogDeleter.java

@@ -19,12 +19,12 @@ public class AutomaticLogDeleter extends JavaPlugin {
 
     @Override
     public void onDisable() {
-
         FileConfiguration config = getConfig();
         if (config.getBoolean("also-delete-logs-on-shutdown")) {
-            new Thread(() -> {
-                deleteLogs();
-            }).start();
+
+            //we aren't using separate thread here, so it has time to finish before server shutdowns
+            
+            deleteLogs();
         }
     }