README: clarify who maintains the image

[michaelklishin]

We've seen some folks interpret "official image" as "maintained by the RabbitMQ team", so perhaps it's worth clarifying.

[yosifkit]

That seems fine to me.

On a related note, we are open to having upstreams maintain their own image if they would like (https://github.com/docker-library/official-images#maintainership). Since the first step is getting involved, we've already seen your team jump in on several issues and even add fixes upstream 😄. Once the repo is transferred, it is just a PR to docker-library/official-images to update the commit referencces and then a PR when necessary to update the Docker Hub docs through docker-library/docs. But if you guys would rather that we keep maintaining it, that is fine too.

[tianon]

I'd add also that taking over wouldn't imply that you're suddenly on your own for knowing how the whole process works -- we can stay as involved as you'd like. ❤️

[michaelklishin]

You have been doing a great job with this image — I see no reason for us to try to get more involved :)

[tianon]

❤️ let us know if that changes!