rn-51: add GitLab security releases

Author: chriscool

rev_news/drafts/edition-51.md

@@ -45,7 +45,7 @@ This edition covers what happened during the month of April 2019.
 [2.15.12](https://enterprise.github.com/releases/2.15.12/notes),
 [2.14.19](https://enterprise.github.com/releases/2.14.19/notes)
 + GitLab [11.10.4](https://about.gitlab.com/2019/05/01/gitlab-11-10-4-released/),
-[11.10.3](https://about.gitlab.com/2019/04/30/security-release-gitlab-11-dot-10-dot-3-released/),
+[11.10.3, 11.9.11, and 11.8.10](https://about.gitlab.com/2019/04/30/security-release-gitlab-11-dot-10-dot-3-released/),
 [11.10.2](https://about.gitlab.com/2019/04/29/security-release-gitlab-11-dot-10-dot-2-released/),
 [11.10.1](https://about.gitlab.com/2019/04/24/gitlab-11-10-1-released/)
 + Bitbucket Server [6.3](https://confluence.atlassian.com/bitbucketserver/bitbucket-server-release-notes-872139866.html)