chore(kernel/environment): fix style
chore(kernel/environment): fix style

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

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