chore(library/tactic/tactic.h): cleanup
chore(library/tactic/tactic.h): cleanup

levnach/lean,fgdorais/lean,UlrikBuchholtz/lean,leanprover-community/lean,sp3ctum/lean,javra/lean,johoelzl/lean,eigengrau/lean,rlewis1988/lean,digama0/lean,digama0/lean,UlrikBuchholtz/lean,sp3ctum/lean,leodemoura/lean,Kha/lean,dselsam/lean,soonhokong/lean-windows,leodemoura/lean,soonhokong/lean-windows,avigad/lean,avigad/lean,dselsam/lean,soonhokong/lean,rlewis1988/lean,leanprover-community/lean,soonhokong/lean-osx,johoelzl/lean,rlewis1988/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover/lean,htzh/lean,eigengrau/lean,sp3ctum/lean,htzh/lean,levnach/lean,javra/lean,leodemoura/lean,eigengrau/lean,johoelzl/lean,fpvandoorn/lean2,sp3ctum/lean,dselsam/lean,leanprover/lean,UlrikBuchholtz/lean,soonhokong/lean,Kha/lean,fpvandoorn/lean,johoelzl/lean,soonhokong/lean-osx,leanprover-community/lean,leodemoura/lean,htzh/lean,javra/lean,c-cube/lean,fpvandoorn/lean2,leanprover/lean,fpvandoorn/lean2,UlrikBuchholtz/lean,levnach/lean,fpvandoorn/lean,levnach/lean,sp3ctum/lean,rlewis1988/lean,Kha/lean,digama0/lean,soonhokong/lean-osx,fgdorais/lean,c-cube/lean,leanprover/lean,c-cube/lean,soonhokong/lean-osx,Kha/lean,dselsam/lean,avigad/lean,digama0/lean,avigad/lean,fpvandoorn/lean2,soonhokong/lean,soonhokong/lean-windows,leanprover/lean,fgdorais/lean,avigad/lean,c-cube/lean,leanprover/lean,eigengrau/lean,fpvandoorn/lean,Kha/lean,johoelzl/lean,htzh/lean,fpvandoorn/lean2,fgdorais/lean,leodemoura/lean,soonhokong/lean-osx,johoelzl/lean,digama0/lean,soonhokong/lean-windows,leodemoura/lean,digama0/lean,soonhokong/lean-windows,dselsam/lean,htzh/lean,javra/lean,leanprover-community/lean,avigad/lean,rlewis1988/lean,c-cube/lean,rlewis1988/lean,UlrikBuchholtz/lean,soonhokong/lean,soonhokong/lean,Kha/lean,leanprover-community/lean,fpvandoorn/lean,leanprover-community/lean,fgdorais/lean,javra/lean,levnach/lean,fgdorais/lean,dselsam/lean,eigengrau/lean