Require gitlab-shell 1.7.6

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

doc/install/installation.md

@@ -149,7 +149,7 @@ GitLab Shell is an ssh access and repository management software developed speci
     cd gitlab-shell
 
     # switch to right version
-    sudo -u git -H git checkout v1.7.4
+    sudo -u git -H git checkout v1.7.6
 
     sudo -u git -H cp config.yml.example config.yml
 

lib/tasks/gitlab/check.rake

@@ -736,7 +736,7 @@ namespace :gitlab do
   end
 
   def check_gitlab_shell
-    required_version = Gitlab::VersionInfo.new(1, 7, 4)
+    required_version = Gitlab::VersionInfo.new(1, 7, 6)
     current_version = Gitlab::VersionInfo.parse(gitlab_shell_version)
 
     print "GitLab Shell version >= #{required_version} ? ... "