Fix duplicate key

Author: Alkarex

examples/smart-data-models.json

@@ -26,7 +26,6 @@
 			"Alert": "https://fiware.github.io/data-models/specs/Alert/schema.json",
 			"Animal": "https://fiware.github.io/data-models/specs/AgriFood/Animal/schema.json",
 			"ArrivalEstimation": "https://fiware.github.io/data-models/specs/UrbanMobility/ArrivalEstimation/schema.json",
-			"ArrivalEstimation": "https://fiware.github.io/data-models/specs/UrbanMobility/unsupported/ArrivalEstimation/schema.json",
 			"Beach": "https://fiware.github.io/data-models/specs/PointOfInterest/Beach/schema.json",
 			"BikeHireDockingStation": "https://fiware.github.io/data-models/specs/Transportation/Bike/BikeHireDockingStation/schema.json",
 			"Building": "https://fiware.github.io/data-models/specs/Building/Building/schema.json",