fixed checklist events

Author: cdaguerre

lib/Trello/Service.php

@@ -193,7 +193,9 @@ public function handleWebhook(Request $request = null)
             case Events::CARD_REMOVE_CHECKLIST:
             case Events::CARD_UPDATE_CHECKLIST_ITEM_STATE:
                 $event = new Event\CardChecklistEvent();
-                $cardId = isset($data['card']['id']) ? $data['card']['id'] : $data['cardTarget']['_id'];
+                $cardId = isset($data['card']['id'])
+                    ? $data['card']['id']
+                    : $data['checklist']['cardTarget']['_id'];
                 $event->setCard($this->getCard($cardId));
                 $event->setChecklist($this->getChecklist($data['checklist']['id']));
                 break;