blog: release post for v7.9.0 (#1200)
blog: release post for v7.9.0 (#1200)

PR-URL: https://github.com/nodejs/node/pull/12319
yous/new.nodejs.org,nodejs/new.nodejs.org,phillipj/new.nodejs.org,yous/new.nodejs.org,nodejs/new.nodejs.org,phillipj/new.nodejs.org