tweak readme to reflect bundled postgres/redis
tweak readme to reflect bundled postgres/redis

coolsvap/docker-gitlab,mehulsbhatt/docker-gitlab-1,jasonbrooks/docker-gitlab,coolsvap/docker-gitlab,navidshaikh/docker-gitlab,jasonbrooks/docker-gitlab,mehulsbhatt/docker-gitlab-1,vrutkovs/docker-gitlab,navidshaikh/docker-gitlab,vrutkovs/docker-gitlab