Missed this file; should use firewall instead of firewalls for configuration.

Author: simensen

examples/simple.php

@@ -28,7 +28,7 @@
 
 $app = (new Stack\Builder())
     ->push('Dflydev\Stack\BasicAuthentication', [
-        'firewalls' => [
+        'firewall' => [
             ['path' => '/', 'anonymous' => true],
             ['path' => '/login'],
         ],