Update US ZipCode, new link

README.md

@@ -984,7 +984,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Telize](https://rapidapi.com/fcambus/api/telize/) | Telize offers location information from any IP address | `apiKey` | Yes | Yes |
 | [TomTom](https://developer.tomtom.com/) | Maps, Directions, Places and Traffic APIs | `apiKey` | Yes | Yes |
 | [Uebermaps](https://uebermaps.com/api/v2) | Discover and share maps with friends | `apiKey` | Yes | Unknown |
-| [US ZipCode](https://smartystreets.com/docs/cloud/us-zipcode-api) | Validate and append data for any US ZipCode | `apiKey` | Yes | Yes |
+| [US ZipCode](https://www.smarty.com/docs/cloud/us-zipcode-api) | Validate and append data for any US ZipCode | `apiKey` | Yes | Yes |
 | [Utah AGRC](https://api.mapserv.utah.gov) | Utah Web API for geocoding Utah addresses | `apiKey` | Yes | Unknown |
 | [ViaCep](https://viacep.com.br) | Brazil RESTful zip codes API | No | Yes | Unknown |
 | [What3Words](https://w3w.co) | Three words as rememberable and unique coordinates worldwide | `apiKey` | Yes | Unknown |