Missing Dependency for py37-astropy

[Christopher Chavez]

> I just upgraded py37-astropy to version 4.2 and I now get the
> following error when I try to run a script:
>
> ImportError: erfa version 1.7 or later must be installed to use
> Astropy. erfa is not installed.

This has been reported: https://trac.macports.org/ticket/61660
The port maintainer has raised the issue upstream: https://github.com/astropy/astropy/issues/11093

> Also, py36-astropy version 4.2 is just plain broken. When I try to run
> a script usinig python 3.6 that calls that version of astropy I get
> the error:
>
> astropy.UnsupportedPythonError: Astropy does not support Python < 3.7
>
> So that should probably be downgraded.

Thanks, I have proposed the downgrade: https://github.com/macports/macports-ports/pull/9249

Christopher A. Chavez