Dangerfile should use failure instead of fail

[Mark E. Schill]

🗣️ Foreword

Thank for taking the time to fill this bug report fully. Without it we may not be able to fix the bug, and the issue may be closed without resolution.

👻 Brief Description

On the repo, ensure that Dangerfile matches https://github.com/sous-chefs/repo-management/blob/master/Dangerfile

Issue sprouted from sous-chefs/meta/issues/110. If not applicable then issue should be closed.