Fixed Lignite and its registration, added 2 more variants - same texture.

src/main/java/com/sosnitzka/taiga/blocks/BlockLignite.java

@@ -12,6 +12,8 @@ import net.minecraft.world.World;
 import java.util.Random;
 
 import static com.sosnitzka.taiga.Items.lignite;
+import static com.sosnitzka.taiga.Items.lignite2;
+import static com.sosnitzka.taiga.Items.lignite3;
 
 public class BlockLignite extends BasicBlock {
 
@@ -35,6 +37,12 @@ public class BlockLignite extends BasicBlock {
 
     @Override
     public Item getItemDropped(IBlockState state, Random rand, int fortune) {
-        return lignite;
+        int r = RANDOM.nextInt(3);
+        if (r == 0) {
+            return lignite;
+        } else if (r == 1) {
+            return lignite2;
+        } else
+            return lignite3;
     }
 }