GitLab requires gitlab-shell v1.9.0

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

CHANGELOG

@@ -27,6 +27,8 @@ v 6.7.0
   - Markdown relative links in the wiki link to wiki pages, markdown relative links in repositories link to files in the repository
   - Added Slack service integration (Federico Ravasio)
   - Better API responses for access_levels (sponsored by O'Reilly Media)
+  - Requires at least 2 unicorn workers
+  - Requires gitlab-shell v1.9+
 
 v 6.6.5
   - Added option to remove issue assignee on project issue page and issue edit page (Jason Blanchard)

lib/tasks/gitlab/check.rake

@@ -742,7 +742,7 @@ namespace :gitlab do
   end
 
   def check_gitlab_shell
-    required_version = Gitlab::VersionInfo.new(1, 8, 5)
+    required_version = Gitlab::VersionInfo.new(1, 9, 0)
     current_version = Gitlab::VersionInfo.parse(gitlab_shell_version)
 
     print "GitLab Shell version >= #{required_version} ? ... "