add rename to Update

src/components/Update.php

@@ -35,6 +35,11 @@ class Update extends \CComponent
         @symlink($target, $link);
     }
 
+    public function rename($old, $new)
+    {
+        @rename($old, $new);
+    }
+
     public function cleanDir($path, $includeDir = false, $initPath = false)
     {
         if (!$initPath) {