More hints on update

README.md

@@ -41,3 +41,9 @@ $ pip install -r requirements.txt
 $ git remote add dokku dokku@dokku.autonomic.zone:gitea
 $ git push dokku
 ```
+
+## Updating Configurations
+
+- `sbin/entrypoint.sh`: app.ini changes
+- `ansible/pre-deploy.yml`: environment and secrets changes
+- `Dockerfile`: container image packages and configuration