Adding screenshot of Mattermost desktop app with GitLab theme

ed76a739 · Ian Tien · 0fa22f21 · ed76a739
Commit ed76a739 authored 8 years ago by Ian Tien
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ with GitLab Single-Sign-On.
  
 *Screenshot: GitLab Mattermost team creation screen with SSO pre-configured from omnibus*
  
-![alt text](http://www.mattermost.org/wp-content/uploads/2015/09/gitlab_mattermost_600.png)
+![alt text](https://gitlab.com/gitlab-org/gitlab-mattermost/raw/master/gitlab_theme.jpg)
  
 ### GitLab Mattermost features include: