Updated Navitia.io documentation URL (#2660)

README.md

@@ -1345,7 +1345,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Impala Hotel Bookings](https://docs.impala.travel/docs/booking-api/) | Hotel content, rates and room bookings | `apiKey` | Yes | No |
 | [Izi](http://api-docs.izi.travel/) | Audio guide for travellers | `apiKey` | Yes | Unknown |
 | [Metro Lisboa](http://app.metrolisboa.pt/status/getLinhas.php) | Delays in subway lines | No | No | No |
-| [Navitia](https://api.navitia.io/) | The open API for building cool stuff with transport data | `apiKey` | Yes | Unknown |
+| [Navitia](https://doc.navitia.io/) | The open API for building cool stuff with transport data | `apiKey` | Yes | Unknown |
 | [Open Charge Map](https://openchargemap.org/site/develop/api) | Global public registry of electric vehicle charging locations | `apiKey` | Yes | Yes |
 | [OpenSky Network](https://opensky-network.org/apidoc/index.html) | Free real-time ADS-B aviation data | No | Yes | Unknown |
 | [Railway Transport for France](https://www.digital.sncf.com/startup/api) | SNCF public API | `apiKey` | Yes | Unknown |