fix(.appveyor.yml): nightly build
fix(.appveyor.yml): nightly build

leanprover-community/lean,Kha/lean,leodemoura/lean,leanprover-community/lean,leodemoura/lean,dselsam/lean,fpvandoorn/lean,leanprover/lean,Kha/lean,leanprover-community/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover-community/lean,digama0/lean,digama0/lean,digama0/lean,fpvandoorn/lean,leanprover/lean,leanprover/lean,leodemoura/lean,digama0/lean,digama0/lean,leodemoura/lean,dselsam/lean,leodemoura/lean,dselsam/lean,leanprover/lean,fpvandoorn/lean,leanprover-community/lean,Kha/lean,leanprover/lean,digama0/lean,leanprover/lean,Kha/lean,dselsam/lean,fpvandoorn/lean,Kha/lean,dselsam/lean,leanprover-community/lean,Kha/lean,leodemoura/lean,dselsam/lean