add that it is not maintained to readme.

[grinsted]

No description provided.

[avalentino]

@grinsted why you say that this project is unmaintained?
I see some activity after your PR. The latest commit is March 2023.

@kapadia could you please clarify?
I'm considering to include this package in the main archive for Debian packages.
Of course is he project is unmaintained upstream this would be a problem.

[grinsted]

I cannot remember why I wrote this. I have a hard time imagining that I came up with this statement by myself, so I suppose I must have read that exact phrasing in a GitHub issue or a forum post or something.

@kapadia just close, ignore, or accept this PR as you feel is appropriate.

[kapadia]

@grinsted @avalentino This project is lightly maintained. I've accepted PRs from contributors in recent time, and will continue to do so.

[avalentino]

Thanks for the info @kapadia
FYI, usgs will be soon in the Debian main archive