Merge pull request #7421 from bbodenmiller/self-signed-cert-note

Self signed SSL cert not supported until 5.1

doc/update/4.2-to-5.0.md

@@ -7,6 +7,7 @@ GitLab 5.0 is affected by critical security vulnerability CVE-2013-4490.
 ## Important changes
 
 - We don't use `gitlab` user any more. Everything will be moved to `git` user
+- Self signed SSL certificates are not supported until GitLab 5.1
 - **requires ruby1.9.3**
 
 ## 0. Stop gitlab