fixed link

doc/README.md

@@ -16,4 +16,4 @@ References
 ---
 
 * [TCAT feed from transit.land](https://www.transit.land/feeds/f-dr997-tompkinsconsolidatedareatransit)
-* [GTFS TCAT feed from Avail](https://realtimetcatbus.availtec.com/InfoPoint/GTFS-Realtime.ashx?&Type=TripUpdat)
+* [GTFS TCAT feed from Avail](https://realtimetcatbus.availtec.com/InfoPoint/GTFS-Realtime.ashx?&Type=TripUpdate)