chore(travis): fix doxygen-upload in Linux build
chore(travis): fix doxygen-upload in Linux build

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