When upgrading to 1.9, you'll need to update your app(s') configuration(s) for
new settings names:

- Rename `AUTH_RATELIMIT` to `AUTH_RATELIMIT_IP`
- Add MESSAGE_RATELIMIT (default `200/day`)
- Add `TZ` to specify server timezone, e.g. `TZ=Etc/UTC`
- Remove `PASSWORD_SCHEME`
- Add `CREDENTIAL_ROUNDS` (default `12`)

If you haven't made these changes already, it's best to bail on this upgrade
FIRST (i.e. Ctrl+C) and run `abra app config` first.