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

simensen · simensen · commit 61950d7ca713 · 2013-08-01T12:12:21.000-07:00
diff --git a/examples/simple.php b/examples/simple.php
@@ -28,7 +28,7 @@
 
 $app = (new Stack\Builder())
     ->push('Dflydev\Stack\BasicAuthentication', [
-        'firewalls' => [
+        'firewall' => [
             ['path' => '/', 'anonymous' => true],
             ['path' => '/login'],
         ],
