Update readme

Author: AlexanderPoellmann

README.md

@@ -184,7 +184,7 @@ The address model provides a method `geocode()` which will try to fetch longitud
 - [2021-02-02] **v1.0** The `geocode` configuration option now defaults to `false`.
 - [2022-05-16] **v1.1** Updated dependencies to PHP 8 and Laravel 8/9 - for older versions please refer to v1.0.
 - [2023-02-21] **v1.2** Laravel 10 support.
-- [2023-09-21] **v1.3** Support custom models for addresses and contacts, thanks to @bfiessinger.
+- [2023-09-21] **v1.3** Support custom models for addresses and contacts, thanks to @bfiessinger. The geocoding feature now requires a Google Maps key, see 'Geocoding' above. Also, @bfiessinger has added fallback support for flags, see pull request #40 for further info.
 
 ## License