Merge branch 'gitter-badge' into 'master'

gitter badge in the readme pointing to gitlabhq/gitlabhq

See merge request !10968

README.md

@@ -4,6 +4,7 @@
 [![Overall test coverage](https://gitlab.com/gitlab-org/gitlab-ce/badges/master/coverage.svg)](https://gitlab.com/gitlab-org/gitlab-ce/pipelines)
 [![Code Climate](https://codeclimate.com/github/gitlabhq/gitlabhq.svg)](https://codeclimate.com/github/gitlabhq/gitlabhq)
 [![Core Infrastructure Initiative Best Practices](https://bestpractices.coreinfrastructure.org/projects/42/badge)](https://bestpractices.coreinfrastructure.org/projects/42)
+[![Gitter](https://badges.gitter.im/gitlabhq/gitlabhq.svg)](https://gitter.im/gitlabhq/gitlabhq?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
 ## Test coverage