Adjust expired range check

Include current second when deciding if cooke has expired.

src/Symfony/Component/BrowserKit/Cookie.php

@@ -296,6 +296,6 @@ class Cookie
      */
     public function isExpired()
     {
-        return null !== $this->expires && 0 != $this->expires && $this->expires < time();
+        return null !== $this->expires && 0 != $this->expires && $this->expires <= time();
     }
 }