chore(.travis.yml): update secure
chore(.travis.yml): update secure

rlewis1988/lean,fgdorais/lean,leanprover-community/lean,johoelzl/lean,dselsam/lean,digama0/lean,avigad/lean,fpvandoorn/lean,leanprover-community/lean,Kha/lean,leanprover/lean,johoelzl/lean,leanprover/lean,leanprover-community/lean,Kha/lean,rlewis1988/lean,leodemoura/lean,avigad/lean,Kha/lean,leanprover-community/lean,leanprover-community/lean,Kha/lean,avigad/lean,fpvandoorn/lean,leanprover/lean,avigad/lean,digama0/lean,rlewis1988/lean,dselsam/lean,leodemoura/lean,fpvandoorn/lean,johoelzl/lean,leodemoura/lean,fgdorais/lean,leanprover/lean,dselsam/lean,digama0/lean,Kha/lean,leanprover/lean,fpvandoorn/lean,avigad/lean,leanprover-community/lean,leanprover/lean,johoelzl/lean,digama0/lean,fgdorais/lean,leodemoura/lean,Kha/lean,fgdorais/lean,fpvandoorn/lean,fpvandoorn/lean,rlewis1988/lean,digama0/lean,leodemoura/lean,fgdorais/lean,dselsam/lean,digama0/lean,rlewis1988/lean,dselsam/lean,dselsam/lean,johoelzl/lean,johoelzl/lean,fgdorais/lean,avigad/lean,rlewis1988/lean,leodemoura/lean