Specify the supported Ubuntu version

README.md

@@ -8,7 +8,7 @@ GitLab!
 After the steps below your GitLab instance should reachable over HTTP,
 and have an admin user with username `root` and password `5iveL!fe`.
-### Ubuntu
+### Ubuntu 12.04
 ```
 sudo apt-get install openssh-server
@@ -74,7 +74,6 @@ external_url "http://gitlab.example.com"
 Run `sudo gitlab-ctl reconfigure` for the change to take effect.
-
 #### Invoking Rake tasks
 To invoke a GitLab Rake task, use `gitlab-rake`. For example: