Added git command to change shell to 1.1.0 to make sure the check passes

doc/update/4.2-to-5.0.md

@@ -32,6 +32,7 @@ sudo chown git:git -R /home/git/repositories/
 # login as git
 sudo su git
 cd /home/git/gitlab-shell
+git checkout v1.1.0
 
 # copy config
 cp config.yml.example config.yml