Make VehicleCreateEvent Cancellable.

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/event/vehicle/VehicleCreateEvent.java

@@ -1,18 +1,30 @@
 package org.bukkit.event.vehicle;
 
 import org.bukkit.entity.Vehicle;
+import org.bukkit.event.Cancellable;
 import org.bukkit.event.HandlerList;
 
 /**
  * Raised when a vehicle is created.
  */
-public class VehicleCreateEvent extends VehicleEvent {
+public class VehicleCreateEvent extends VehicleEvent implements Cancellable {
     private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
 
     public VehicleCreateEvent(final Vehicle vehicle) {
         super(vehicle);
     }
 
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+
     @Override
     public HandlerList getHandlers() {
         return handlers;