Ensure all listener aggregates are attached correctly.

This patch ensures that all listener aggregates use the form:

```php
    $aggregate->attach($events);
```

vs

```php
    $events->attach($aggregate);
```

as the latter is unsupported in v3 versions of zend-eventmanager.

Module.php

@@ -38,7 +38,7 @@ public function onBootstrap(MvcEvent $e)
         $serviceManager = $app->getServiceManager();
         $eventManager   = $app->getEventManager();
 
-        $eventManager->attach($serviceManager->get('ZF\ApiProblem\ApiProblemListener'));
+        $serviceManager->get('ZF\ApiProblem\ApiProblemListener')->attach($eventmanager);
         $eventManager->attach(MvcEvent::EVENT_RENDER, [$this, 'onRender'], 100);
 
         $sendResponseListener = $serviceManager->get('SendResponseListener');
@@ -67,7 +67,7 @@ public function onRender(MvcEvent $e)
 
             // register at high priority, to "beat" normal json strategy registered
             // via view manager, as well as HAL strategy.
-            $events->attach($services->get('ZF\ApiProblem\ApiProblemStrategy'), 400);
+            $services->get('ZF\ApiProblem\ApiProblemStrategy')->attach($events, 400);
         }
     }
 }

src/Listener/ApiProblemListener.php

@@ -137,7 +137,7 @@ public function onDispatch(MvcEvent $e)
 
         // Attach the ApiProblem render.error listener
         $events = $app->getEventManager();
-        $events->attach($services->get('ZF\ApiProblem\RenderErrorListener'));
+        $services->get('ZF\ApiProblem\RenderErrorListener')->attach($events);
     }
 
     /**