Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

vendor/composer/autoload_namespaces.php

@@ -21,4 +21,5 @@ return array(
     'Doctrine\\Common\\Annotations\\' => array($vendorDir . '/doctrine/annotations/lib'),
     'Doctrine\\Common\\' => array($vendorDir . '/doctrine/common/lib'),
     'Composer\\Installers\\' => array($vendorDir . '/composer/installers/src'),
+    'Asm89\\Stack' => array($vendorDir . '/asm89/stack-cors/src'),
 );

vendor/composer/autoload_static.php

@@ -358,6 +358,13 @@ class ComposerStaticInitDrupal8
                 0 => __DIR__ . '/..' . '/composer/installers/src',
             ),
         ),
+        'A' => 
+        array (
+            'Asm89\\Stack' => 
+            array (
+                0 => __DIR__ . '/..' . '/asm89/stack-cors/src',
+            ),
+        ),
     );
 
     public static $classMap = array (