Add 'is_official' field to GTFS JSON

Author: emmambd

catalogs/sources/gtfs/schedule/de-bayern-gesamtnetz-der-deutschen-bahn-gtfs-768.json

@@ -3,6 +3,7 @@
     "data_type": "gtfs",
     "provider": "Long-distance rail transport in Germany",
     "name": "gtfs.de - GTFS for Germany Data provided by DELFI e.V",
+    "is_official": "True",
     "location": {
         "country_code": "DE",
         "subdivision_name": "",
@@ -20,4 +21,4 @@
         "latest": "https://storage.googleapis.com/storage/v1/b/mdb-latest/o/de-bayern-gesamtnetz-der-deutschen-bahn-gtfs-768.zip?alt=media"
     },
     "redirect": []
-}
+}