+ Fixed crafting not working in 1.13.2 (PULL REQUEST #28 by steve4744)
+ Fixed sellhead calculations in 1.9.x-1.13.x servers (ISSUE #27)
+ Fixed heads not stacking occasionally
+ Fixed IAE error when sheep, parrot, llama and horse heads are dropped
+ Mob drops managed by HeadsPlus no longer need a player/killer for heads to be dropped.