Add http link to changelog to help page
Description
On the Help page you are notified of a new Gitlab version, and that the current used one is outdated. It would be helpful to get to the changelog via hyperlink, so the admin can check whats been implemented or fixed since his/her currently running version.
Proposal
Add hyperlink to public changelog to help page of gitlab.
Links / references
CE changelog https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md