Publish a CHANGELOG

[vielmetti]

What problem are you facing?

Looking for a change log for the project, to see in convenient text
format information about what's new.

I'm aware that I can get these details from the diff log and from
the release notes, but they are not all consolidated in one place.

The "repo linter" project at https://github.com/todogroup/repolinter
looks for a CHANGELOG file in the home directory.

How could the Equinix Metal CLI help solve this problem?

Create a file CHANGELOG and as releases are updated copy out
the salient points from each edition's release notes into it.