Update Transport for Boston, US, new link

README.md

@@ -1667,7 +1667,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Transport for Belgium](https://docs.irail.be/) | The iRail API is a third-party API for Belgian public transport by train | No | Yes | Yes |
 | [Transport for Berlin, Germany](https://github.com/derhuerst/vbb-rest/blob/3/docs/index.md) | Third-party VBB API | No | Yes | Unknown |
 | [Transport for Bordeaux, France](https://opendata.bordeaux-metropole.fr/explore/) | Bordeaux Métropole public transport and more (France) | `apiKey` | Yes | Unknown |
-| [Transport for Boston, US](https://mbta.com/developers/v3-api) | MBTA API | No | No | Unknown |
+| [Transport for Boston, US](https://www.mbta.com/developers/v3-api) | MBTA API | No | No | Unknown |
 | [Transport for Budapest, Hungary](https://bkkfutar.docs.apiary.io) | Budapest public transport API | No | Yes | Unknown |
 | [Transport for Chicago, US](http://www.transitchicago.com/developers/) | Chicago Transit Authority (CTA) | `apiKey` | No | Unknown |
 | [Transport for Czech Republic](https://www.chaps.cz/eng/products/idos-internet) | Czech transport API | No | Yes | Unknown |