vendor/autoload: no failure on master, show error

vendor/autoload.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Icinga\Module\Reactbundle {
+
+    use Icinga\Application\Hook\ApplicationStateHook;
+
+    class ApplicationState extends ApplicationStateHook
+    {
+        public function collectMessages()
+        {
+            $this->addError(
+                'reactbundle.master',
+                time(),
+                'Please install a Release version of the Reactbundle module, not the GIT master'
+            );
+        }
+    }
+
+    $this->provideHook('ApplicationState', '\\Icinga\\Module\\Reactbundle\\ApplicationState');
+}