Update ccache.md
Update ccache.md

fix typo [skip ci]
leanprover/lean,leanprover-community/lean,digama0/lean,soonhokong/travis_test,Kha/lean,soonhokong/lean-windows,leodemoura/lean,leanprover-community/lean,leanprover/lean,johoelzl/lean,fpvandoorn/lean2,htzh/lean,UlrikBuchholtz/lean,UlrikBuchholtz/lean,c-cube/lean,fgdorais/lean,levnach/lean,soonhokong/lean-windows,Kha/lean,eigengrau/lean,soonhokong/lean-windows,eigengrau/lean,johoelzl/lean,UlrikBuchholtz/lean,c-cube/lean,soonhokong/lean-windows,fpvandoorn/lean2,Kha/lean,sp3ctum/lean,UlrikBuchholtz/lean,UlrikBuchholtz/lean,levnach/lean,soonhokong/lean,rlewis1988/lean,htzh/lean,fgdorais/lean,leodemoura/lean,fgdorais/lean,avigad/lean,avigad/lean,soonhokong/travis_test,sp3ctum/lean,leanprover-community/lean,leanprover/lean,javra/lean,leodemoura/lean,c-cube/lean,soonhokong/lean-osx,soonhokong/lean,soonhokong/lean-windows,digama0/lean,dselsam/lean,soonhokong/lean-osx,Kha/lean,codyroux/lean0.1,leanprover/lean,fpvandoorn/lean2,c-cube/lean,soonhokong/lean,soonhokong/lean-osx,sp3ctum/lean,codyroux/lean0.1,avigad/lean,leodemoura/lean,htzh/lean,eigengrau/lean,fgdorais/lean,fpvandoorn/lean,levnach/lean,c-cube/lean,dselsam/lean,avigad/lean,leodemoura/lean,leanprover-community/lean,rlewis1988/lean,soonhokong/lean-osx,fpvandoorn/lean2,javra/lean,johoelzl/lean,digama0/lean,leodemoura/lean,eigengrau/lean,rlewis1988/lean,dselsam/lean,javra/lean,fgdorais/lean,sp3ctum/lean,htzh/lean,digama0/lean,Kha/lean,avigad/lean,javra/lean,fpvandoorn/lean,fpvandoorn/lean,digama0/lean,avigad/lean,fpvandoorn/lean,eigengrau/lean,fgdorais/lean,soonhokong/lean-osx,rlewis1988/lean,soonhokong/travis_test,levnach/lean,codyroux/lean0.1,johoelzl/lean,sp3ctum/lean,levnach/lean,codyroux/lean0.1,dselsam/lean,javra/lean,fpvandoorn/lean2,johoelzl/lean,leanprover-community/lean,leanprover/lean,soonhokong/lean,fpvandoorn/lean,digama0/lean,soonhokong/lean,rlewis1988/lean,soonhokong/travis_test,leanprover-community/lean,dselsam/lean,dselsam/lean,rlewis1988/lean,leanprover/lean,fpvandoorn/lean,htzh/lean,johoelzl/lean,Kha/lean