Point to correct project on githost.io.

doc/development/ci_setup.md

@@ -4,7 +4,7 @@ This document describes what services we use for testing GitLab and GitLab CI.
 
 We currently use three CI services to test GitLab:
 
-1. GitLab CI on [GitHost.io](https://gitlab-ce.githost.io/projects/2/) for the [GitLab.com repo](https://gitlab.com/gitlab-org/gitlab-ce)
+1. GitLab CI on [GitHost.io](https://gitlab-ce.githost.io/projects/4/) for the [GitLab.com repo](https://gitlab.com/gitlab-org/gitlab-ce)
 2. GitLab CI at ci.gitlab.org to test the private GitLab B.V. repo at dev.gitlab.org
 3. [Semephore](https://semaphoreapp.com/gitlabhq/gitlabhq/) for [GitHub.com repo](https://github.com/gitlabhq/gitlabhq)