New Advancement (Sticks And Stones Break Your Bones)

The advancement "Sticks ans stones break your bones" is an advancement players can achieve by using up all the durability of a stone sword killing skeletons. Basically, you can earn this by using up a stone sword only using skeletons. Since a new cave update is coming, and stone and skeletons are gonna spawn in the caves, I figured this would be a nice addition.