Bump light version again

Tuinity had some problems, and it bumped the version. So
we must also.

Author: Spottedleaf

src/main/java/ca/spottedleaf/starlight/mixin/common/world/ChunkSerializerMixin.java

@@ -4,7 +4,6 @@
 import ca.spottedleaf.starlight.common.chunk.ExtendedChunk;
 import ca.spottedleaf.starlight.common.light.SWMRNibbleArray;
 import ca.spottedleaf.starlight.common.util.WorldUtil;
-import ca.spottedleaf.starlight.common.world.ExtendedWorld;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.ListTag;
 import net.minecraft.server.world.ServerWorld;
@@ -24,7 +23,7 @@
 @Mixin(ChunkSerializer.class)
 public abstract class ChunkSerializerMixin {
 
-    private static final int STARLIGHT_LIGHT_VERSION = 2;
+    private static final int STARLIGHT_LIGHT_VERSION = 3;
 
     private static final String UNINITIALISED_SKYLIGHT_TAG = "starlight.skylight_uninit";
     private static final String STARLIGHT_VERSION_TAG = "starlight.light_version";