fix whitespace problem

src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php

@@ -37,7 +37,7 @@ class AnnotationDirectoryLoader extends AnnotationFileLoader
         $dir = $this->locator->locate($path);
 
         $collection = new RouteCollection();
-	$collection->addResource(new DirectoryResource($dir));
+        $collection->addResource(new DirectoryResource($dir));
         foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir), \RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
             if (!$file->isFile() || '.php' !== substr($file->getFilename(), -4)) {
                 continue;