Created the DashShutdownHook.java

src/main/java/de/gnmyt/mcdash/api/DashShutdownHook.java

@@ -0,0 +1,16 @@
+package de.gnmyt.mcdash.api;
+
+import de.gnmyt.mcdash.MCDashWrapper;
+
+public class DashShutdownHook extends Thread {
+
+    private static final Logger LOG = new Logger(DashShutdownHook.class);
+    @Override
+    public void run() {
+        setName("MCDash-Shutdown-Hook");
+
+        LOG.info("Stopping the server...");
+        ServerManager serverManager = MCDashWrapper.getServerManager();
+        serverManager.stopServers();
+    }
+}