add event name in mail

app/Mail/VolunteerUnassignToTaskMail.php

@@ -46,6 +46,7 @@ class VolunteerUnassignToTaskMail extends Mailable
                 'taskName' => $this->data['taskName'],
                 'start' => FormatDate::formatDate($this->data['start']),
                 'end' => FormatDate::formatDate($this->data['end']),
+                'eventName' => $this->data['eventName'],
             ]
         );
     }