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c6639597 - Rename `pep440-rs` to `Readme.md` (#1014)

Rename `pep440-rs` to `Readme.md` (#1014) This is due to a bug in Maturin (https://github.com/PyO3/maturin/pull/1915), so I'll just fix our setup to work with existing versions. Closes https://github.com/astral-sh/puffin/issues/991.