ensures only one notification email per conversation

Author: Kneeba921

app/notifiers/better_together/new_message_notifier.rb

@@ -48,7 +48,7 @@ def should_send_email?
           false
         else
           # Only send one email per unread notifications per conversation
-          message.id == unread_notifications.first.event.record_id
+          message.id == unread_notifications.last.event.record_id
         end
       end
     end