Changed 2-0-stable to 2-2-stable which is the branch that this is on.

1200614e · Kevin Krauss · c6126c8e · 1200614e
Commit 1200614e authored 11 years ago by Kevin Krauss
--- a/doc/installation.md
+++ b/doc/installation.md
@@ -48,7 +48,7 @@ Create a user for GitLab:
    cd gitlab-ci
  
    # Checkout preferable version
-    sudo -u gitlab_ci -H  git checkout 2-0-stable
+    sudo -u gitlab_ci -H  git checkout 2-2-stable
  
 ## 5. Setup application