bump stable version of gazel in the README
bump stable version of gazel in the README

kubernetes/repo-infra,ixdy/kubernetes-repo-infra,ixdy/kubernetes-repo-infra,mikedanese/gazel,kubernetes/repo-infra,spxtr/gazel,spxtr/gazel,kubernetes/repo-infra,ixdy/kubernetes-repo-infra,mikedanese/gazel