[Bleeding] Event no longer implements Serializable.

src/main/java/org/bukkit/event/block/BlockCanBuildEvent.java

@@ -13,7 +13,6 @@ import org.bukkit.event.HandlerList;
  * <li>If you want to figure out what is being placed, use {@link #getMaterial()} or {@link #getMaterialId()} instead.</li>
  * </ul>
  */
-@SuppressWarnings("serial")
 public class BlockCanBuildEvent extends BlockEvent {
     private static final HandlerList handlers = new HandlerList();
     protected boolean buildable;