Add ChunkEvent.Unload to forgeToSpongeEventMapping
import org.spongepowered.api.event.world.LoadWorldEvent;
import org.spongepowered.api.event.world.UnloadWorldEvent;
import org.spongepowered.api.event.world.chunk.LoadChunkEvent;
+import org.spongepowered.api.event.world.chunk.UnloadChunkEvent;
import org.spongepowered.api.plugin.PluginManager;
import org.spongepowered.asm.util.PrettyPrinter;
import org.spongepowered.common.SpongeImpl;
.put(BlockEvent.NeighborNotifyEvent.class, NotifyNeighborBlockEvent.class)
.put(ChunkEvent.Load.class, LoadChunkEvent.class)
+ .put(ChunkEvent.Unload.class, UnloadChunkEvent.class)
.put(ExplosionEvent.Start.class, org.spongepowered.api.event.world.ExplosionEvent.Pre.class)
.put(ExplosionEvent.Detonate.class, org.spongepowered.api.event.world.ExplosionEvent.Detonate.class)
.put(WorldEvent.Load.class, LoadWorldEvent.class)
