chore(library/blast/simplifier/simplifier): use '-->' for tracing a rewrite
chore(library/blast/simplifier/simplifier): use '-->' for tracing a rewrite

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