Updating link to GitLab Mattermost install instructions

README.md

@@ -44,7 +44,7 @@ with GitLab Single-Sign-On.
 ### How to Install GitLab Mattermost
-- [GitLab Mattermost Install Guide for omnibus](https://gitlab.com/gitlab-org/omnibus-gitlab/tree/master/doc/gitlab-mattermost)
+- [GitLab Mattermost Install Guide for omnibus](http://doc.gitlab.com/omnibus/gitlab-mattermost/)
 - [GitLab Mattermost SSO Documentation](https://github.com/mattermost/platform/blob/master/doc/integrations/sso/gitlab-sso.md)
 - [GitLab Mattermost Troubleshooting Forum](http://forum.mattermost.org/c/general/gitlab)
@@ -57,7 +57,4 @@ https://gitlab.com/gitlab-org/gitlab-mattermost/issues).
 *Screenshot: Preview of Slack Import feature available in GitLab 8.0 release* 
-![alt text](http://www.mattermost.org/wp-content/uploads/2015/09/slack_import.png)
-
-
-
+![alt text](http://www.mattermost.org/wp-content/uploads/2015/09/slack_import.png)
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