| ⇢ | A | FeedbackReceived added | |
| ⇢ | A | FeedbackListener added |
| ⇢ | A | FeedbackReceived::content() added | |
| ⇢ | A | FeedbackReceived::attachments() added | |
| ⇢ | A | FeedbackReceived::envelope() added | |
| ⇢ | A | FeedbackReceived::__construct() added | |
| ⇢ | A | FeedbackListener::handle() added |