chore: checkpoint before Python removal

vendor/colorchoice/README.md

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+# colorchoice
+
+> Global override of color control
+
+[![Documentation](https://img.shields.io/badge/docs-master-blue.svg)][Documentation]
+![License](https://img.shields.io/crates/l/colorchoice.svg)
+[![Crates Status](https://img.shields.io/crates/v/colorchoice.svg)](https://crates.io/crates/colorchoice)
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <https://www.apache.org/licenses/LICENSE-2.0>)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or <https://opensource.org/license/mit>)
+
+at your option.
+
+## [Contribute](../../CONTRIBUTING.md)
+
+Special note: to be successful, this crate **cannot** break compatibility or
+else different crates in the hierarchy will be reading different globals.
+While end users can work around this, it isn't ideal.    If we need a new API, we can make
+the old API an adapter to the new logic.
+
+Similarly, we should strive to reduce **risk** of breaking compatibility by
+exposing as little as possible.  Anything more should be broken out into a
+separate crate that this crate can call into.
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual-licensed as above, without any additional terms or
+conditions.
+
+[Documentation]: https://docs.rs/colorchoice