README.md in gitlab-mail_room-0.0.20 vs README.md in gitlab-mail_room-0.0.21

@@ -377,11 +377,11 @@
 
 ```yaml
 :delivery_method: postback
 :delivery_options:
   :delivery_url: https://example.com/rails/action_mailbox/relay/inbound_emails
-  :delivery_username: actionmailbox
-  :delivery_password: <INGRESS_PASSWORD>
+  :username: actionmailbox
+  :password: <INGRESS_PASSWORD>
 ```
 
 ## Receiving `postback` in Rails ##
 
 If you have a controller that you're sending to, with forgery protection