Make calculateStrength of harvestTool public (was package? forgotten access modifier?)

src/main/java/tconstruct/library/tools/HarvestTool.java

@@ -49,7 +49,7 @@ public abstract class HarvestTool extends ToolCore
         return super.getDigSpeed(stack, block, meta);
     }
 
-    float calculateStrength (NBTTagCompound tags, Block block, int meta)
+    public float calculateStrength (NBTTagCompound tags, Block block, int meta)
     {
         float mineSpeed = tags.getInteger("MiningSpeed");
         int heads = 1;