Change visibility from protected to private where possible

src/Dispatching/Dispatcher.php

@@ -71,7 +71,7 @@ class Dispatcher implements DispatcherInterface
      * @param mixed[] $dispatchables
      * @return DispatchStack
      */
-    protected function getDispatchStack($dispatchables)
+    private function getDispatchStack($dispatchables)
     {
         $stack = new DispatchStack($this);
         foreach ($dispatchables as $dispatchable) {

src/Server.php

@@ -15,7 +15,7 @@ use WellRESTed\Transmission\TransmitterInterface;
 class Server
 {
     /** @var mixed[] */
-    protected $attributes = [];
+    private $attributes = [];
     /** @var DispatcherInterface */
     private $dispatcher;
     /** @var string|null attribute name for matched path variables */