Allow fishermen villagers to sell fishing rod enchantments

In the new snapshots/betas, Mojang has tried to rebalance the librarian villager trading system. While I am generally in favor of these changes to make getting strong gear more challenging, an oversight has been made and now, you are unable to access crossbow, trident, and fishing rod enchanted books from the villagers. Although you can gain fishing rod enchants from a variety of means, I think it would be a great thing if the fisherman villager could sell the “Luck of the Sea” and “Lure” enchanted books to the player. These would probably be a Master-level trade, and I envision the villagers selling one or the other. This would give a great use to an otherwise mediocre villager type, and help in the rebalancing changes.