add gtfs.file to config-example.yml, #1973
add gtfs.file to config-example.yml, #1973

boldtrn/graphhopper,graphhopper/graphhopper,devemux86/graphhopper,fbonzon/graphhopper,don-philipe/graphhopper,graphhopper/graphhopper,boldtrn/graphhopper,devemux86/graphhopper,don-philipe/graphhopper,devemux86/graphhopper,fbonzon/graphhopper,graphhopper/graphhopper,fbonzon/graphhopper,don-philipe/graphhopper,graphhopper/graphhopper,boldtrn/graphhopper,fbonzon/graphhopper,don-philipe/graphhopper,devemux86/graphhopper,boldtrn/graphhopper