Update One Map, Singapore, new link

README.md

@@ -965,7 +965,7 @@ API | Description | Auth | HTTPS | CORS |
 | [MapQuest](https://developer.mapquest.com/) | To access tools and resources to map the world | `apiKey` | Yes | No | Yes
 | [Mexico](https://github.com/IcaliaLabs/sepomex) | Mexico RESTful zip codes API | No | Yes | Unknown |
 | [Nominatim](https://nominatim.org/release-docs/latest/api/Overview/) | Provides worldwide forward / reverse geocoding | No | Yes | Yes |
-| [One Map, Singapore](https://docs.onemap.sg/) | Singapore Land Authority REST API services for Singapore addresses | `apiKey` | Yes | Unknown |
+| [One Map, Singapore](https://www.onemap.gov.sg/docs/) | Singapore Land Authority REST API services for Singapore addresses | `apiKey` | Yes | Unknown |
 | [OnWater](https://onwater.io/) | Determine if a lat/lon is on water or land | No | Yes | Unknown |
 | [Open Topo Data](https://www.opentopodata.org) | Elevation and ocean depth for a latitude and longitude | No | Yes | No |
 | [OpenCage](https://opencagedata.com) | Forward and reverse geocoding using open data | `apiKey` | Yes | Yes |