Description of problem: A set of PRs (https://github.com/gluster/glusterdocs/pulls) are seemingly failing at mkdocs build --clean --strict fails cf. https://travis-ci.org/gluster/glusterdocs/builds/412459259?utm_source=github_status&utm_medium=notification
I've sent a pull request to the repo to move to mkdocs 1.0. The latest upgrade caused issues in the verification step. This should get us back and running.
This is now fixed upstream. You will need to rebase all your patches for Travis CI to be green.