feat(Makefile): re-run cask only if Cask file is changed
feat(Makefile): re-run cask only if Cask file is changed

Hodapp87/cs6460_project,cjmazey/fork_leanprover_tutorial,avigad/tutorial,Hodapp87/cs6460_project,cjmazey/fork_leanprover_tutorial,cjmazey/fork_leanprover_tutorial,leanprover/tutorial,leanprover/tutorial,leanprover/tutorial,soonhokong/lean-tutorial,fpvandoorn/tutorial,Hodapp87/cs6460_project,avigad/tutorial,soonhokong/lean-tutorial,avigad/tutorial,fpvandoorn/tutorial,soonhokong/lean-tutorial,fpvandoorn/tutorial