Missing GitLab Shell upgrade steps in 5.3 to 5.4 Upgrade Guide

Created by: terrywang

As per GitLab 5.4 stable installation guide installation.md guide, the correct GitLab shell version to use with GitLab 5.4 should be v1.5.0.

However, in the GitLab 5.3 to 5.4 upgrade guide => 5.3-to-5.4.md, it is NOT mentioned anyway.

That means after the upgrade, GitLab 5.4 will be using gitlab-shell v1.4.0, it may work (in my case it did work) but may cause problems (missing functions or something weird).

Upgrade guide needs to be fixed.

BTW: table of gitlab and gitlab-shell version 5.0 v1.1.0 5.1 v1.3.0 5.2 v1.4.0 5.3 v1.4.0 5.4 v1.5.0

Pull Request sent => pull request 4786