new function for registering item for drop grass

grass.lua

@@ -10,7 +10,7 @@ local function farming_update_grass_item()
 end
 
 function farming_register_grass_item(item,rarity)
-	farming.grass=table.insert(farming.grass,{items=item,rarity=rarity})
+	farming.grass[#farming.grass+1]={items=item,rarity=rarity}
 end
 
 farming_register_grass_item("farming:seed_wheat",5)