Update mappings to stable_39-1.12 (#322)

src/main/java/appeng/block/paint/BlockPaint.java

@@ -44,6 +44,7 @@ import net.minecraftforge.common.property.IUnlistedProperty;
 import net.minecraftforge.fml.relauncher.Side;
 import net.minecraftforge.fml.relauncher.SideOnly;
 
+import javax.annotation.Nonnull;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Random;
@@ -81,7 +82,7 @@ public class BlockPaint extends AEBaseTileBlock {
     }
 
     @Override
-    public BlockRenderLayer getBlockLayer() {
+    public BlockRenderLayer getRenderLayer() {
         return BlockRenderLayer.CUTOUT;
     }