docs: Update README.md

README.md

@@ -83,6 +83,7 @@ The docker container takes various environment variables:
 | `SESSION_EXPIRE_AT_BROWSER_CLOSE`| Set to `False` if you want to keep sessions valid after browser close.                                          | `True`                     | Optional            |
 | `SESSION_COOKIE_AGE`             | Define the maximum cookie age in minutes.                                                                       | `30`                       | Optional            |
 | `EXPIRY_THRESHOLD_DAYS`          | Defines the days prior item expiry when an Apprise expiry notification should be sent out.                      | `30`                       | Optional            |
+| `EXPIRY_LAST_NOTIFICATION_DAYS`          | Defines the days prior item expiry when another final Apprise expiry notification should be sent out.                      | `7`                       | Optional            |
 | `TZ`                             | Defines the `TIME_ZONE` variable in Django's settings.py.                                                       | `Europe/Berlin`            | Optional            |
 | `SECRET_KEY`                     | Defines a fixed secret key for the Django framework. If missing, a secure secret is auto-generated on the server-side each time the container starts. | `<auto-generated>`         | Optional            |
 | `PORT`                           | Defines a custom port. Used to set `CSRF_TRUSTED_ORIGINS` in conjunction with the `DOMAIN` environment variable for the Django framework. Only necessary, if VoucherVault is operated on a different port than `8000`, `80` or `443`. | `8000`                     | Optional            |