Cave Spiders drop fermented spider eyes instead of regular ones

Cave spiders are harder to both find and kill than regular spiders, so they should have something to make it worthwhile. Since regular spiders drop regular spider eyes, it would make sense then for the regular spider eye drop of cave spiders to be replaced by a fermented spider eye. Fermented spider eyes aren't very hard to craft anyway, so it wouldn't be overpowered, and it would at least give players some incentive to fight cave spiders.