Update mappings to stable_39-1.12 (#322)

src/main/java/appeng/block/storage/BlockChest.java

@@ -38,6 +38,7 @@ import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 
@@ -56,7 +57,7 @@ public class BlockChest extends AEBaseTileBlock {
     }
 
     @Override
-    public BlockRenderLayer getBlockLayer() {
+    public BlockRenderLayer getRenderLayer() {
         return BlockRenderLayer.CUTOUT;
     }