Greenkeeper.io has been shutdown

[Standard8]

We're opening this issue because your project has previously used Greenkeeper.io. Greenkeeper.io was shutdown on 3rd June 2020. We are therefore removing the obsolete Greenkeeper.io integration.

If you are already using an alternative solution, you can close and ignore this issue.

Other alternatives are available, various Mozilla repositories already use Renovate.

If you have any questions, reach out in #github-admin:mozilla.org on matrix.