Update Old Version Public Keys?

Hello Apters,

I noticed while making tests for an extension that supports older versions of PostgreSQL that the public keys for the
8.4and 9.1 (but not 9.0) repos are out-of-date. Some details here: 

  https://github.com/docker-library/postgres/issues/737

Any chance they could be updated? I realize that the community had dropped support for 9.4 and earlier, but as long as
thereare repos, perhaps the keys should be kept up-to-date? 

Thanks,

David