Fix action caller next middleware handling (#210)

src/Middleware/ActionCaller.php

@@ -31,6 +31,8 @@ public function __construct(string $class, string $method, ContainerInterface $c
     public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
     {
         $controller = $this->container->get($this->class);
-        return (new Injector($this->container))->invoke([$controller, $this->method], [$request, $handler]);
+        $response = (new Injector($this->container))->invoke([$controller, $this->method], [$request, $handler]);
+        $handler->handle($request);
+        return $response;
     }
 }