Update is_official value to string format

Changed the value of 'is_official' from a boolean to a string.

Author: emmambd

catalogs/sources/gtfs/schedule/ro-timis-societatea-metropolitana-de-transport-timisoara-gtfs-2868.json

@@ -3,7 +3,7 @@
     "data_type": "gtfs",
     "provider": "Societatea Metropolitană de Transport Timișoara",
     "status": "active",
-    "is_official": True,
+    "is_official": "True",
     "feed_contact_email": "relatii.publice@smtt.ro"
     "location": {
         "country_code": "RO",