Previously, I maintained supported versions by revising a file of versions. This was monotonous, like time.
Now, these are just based upon the documented EoL dates of the versions published by Magento.
`kind` is a new input property for the `supported-version` action which
allows one to define what specific versions of Magento they support.
Currently, `kind` supports `latest`, `currently-supported`, and `custom`. See the
README for `supported-version` if you want more specifics