TripDescriptor.direction_id is not supported

[barbeau]

When exporting a GTFS-realtime .pb file, I'm seeing TripDescriptor.direction_id get exported like this:

    trip {
      trip_id: "15837958-DEC19-RAIL-Weekday-01"
      schedule_relationship: SCHEDULED
      route_id: "901"
      6: 1
    }

So the project just needs to be updated to the latest gtfs-realtime.proto.

@kurtraschke What are your thoughts on switching from the OBA GTFS-RT exportor to gtfs-realtime-bindings? Or are you using extensions that would prevent this?

[kurtraschke]

Yes, I'm using onebusaway-gtfs-realtime-api for the extensions; I've opened OneBusAway/onebusaway-gtfs-realtime-api#16 to bump the upstream dependency.