Merge pull request #68 from ker0x/hotfix/issue-67

[fix #67] Add parameter tag to null when sending an action

src/Api/Send.php

@@ -93,7 +93,7 @@ public function action(string $recipient, string $action, string $notificationTy
         $this->isValidAction($action);
         $this->isValidNotificationType($notificationType);
 
-        $request = new SendRequest($this->pageToken, $action, $recipient, $notificationType, SendRequest::TYPE_ACTION);
+        $request = new SendRequest($this->pageToken, $action, $recipient, $notificationType, null, SendRequest::TYPE_ACTION);
         $response = $this->client->post('me/messages', $request->build());
 
         return new SendResponse($response);