Fixed a bug that let vanilla wither skeleton skulls drop in addition to HeadHunter skulls.
Reduced default looting effect from +8% per level to +5% per level (now adds 15% to the drop chance at Looting 3). If you already have HeadHunter installed, you will have to manually change this in config.yml.
Wither skeletons now use default wither skeleton skull items (instead of player head items). This will allow you to get the Advancement for picking up a wither skeleton head while using HeadHunter, and will allow you to spawn the Wither boss with HeadHunter heads.