Added getter for CommandRegistry on CommandBus

src/CommandBus.php

@@ -26,6 +26,11 @@ class CommandBus implements CommandBusInterface
         $this->servers = new SplObjectStorage();
     }
 
+    public function getRegistry(): CommandRegistry
+    {
+        return $this->commandRegistry;
+    }
+
     public function addServer(ServerInterface $server): void
     {
         $this->servers->attach($server);