Updating linked-gtfs to latest GTFS spec#20

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Shghazy wants to merge 4 commits intoOpenTransport:masterfrom

Shghazy:gtfs2022

Commits on Jan 23, 2022

Updating gtfs classes to latest GTFS spec
Shghazy
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Commits on Feb 27, 2022

Added adms:versionNotes and a deprecated Gondola
Shghazy
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Commits on Mar 13, 2022

Updated Object Properties to latest gtfs spec
Shghazy
committed

Commits on Mar 20, 2022

Updated Data Properties to latest gtfs spec
Shghazy
committed