graddle update

remappedSrc/me/lukasabbe/bookshelfinspector/data/BookData.java

@@ -0,0 +1,20 @@
+package me.lukasabbe.bookshelfinspector.data;
+
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.math.BlockPos;
+
+public class BookData {
+    public ItemStack itemStack;
+    public BlockPos pos;
+    public int slotId;
+
+    public BookData(ItemStack itemStack, BlockPos pos, int slotId) {
+        this.itemStack = itemStack;
+        this.pos = pos;
+        this.slotId = slotId;
+    }
+
+    public static BookData empty(){
+        return new BookData(ItemStack.EMPTY, null, -1);
+    }
+}