Updated the entry for Finnish transport API (#148)

Finnish transport APIs (Digitransit) now require registration and use of API keys.

README.md

@@ -1696,7 +1696,7 @@
 | [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 |
 | [Transport for Denver, US](http://www.rtd-denver.com/gtfs-developer-guide.shtml) | RTD | No | No | Unknown |
-| [Transport for Finland](https://digitransit.fi/en/developers/) | Finnish transport API | No | Yes | Unknown |
+| [Transport for Finland](https://digitransit.fi/en/developers/) | Finnish transport API | `apiKey` | Yes | Unknown |
 | [Transport for Germany](http://data.deutschebahn.com/dataset/api-fahrplan.html) | Deutsche Bahn (DB) API | `apiKey` | No | Unknown |
 | [Transport for Grenoble, France](https://www.mobilites-m.fr/pages/opendata/OpenDataApi.html) | Grenoble public transport | No | No | No |
 | [Transport for Hessen, Germany](https://opendata.rmv.de/site/start.html) | RMV API (Public Transport in Hessen) | No | Yes | Unknown |