gem 0.1.1

Color representations and conversions
Documentation 
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### Fixed

- docs.rs build was failing: `#![feature(doc_auto_cfg)]` was merged into `doc_cfg` and removed as
  of the nightly toolchain docs.rs builds with (rustc 1.92+). Switched to `#![feature(doc_cfg)]`,
  the same fix already applied in `grixy` and `ixy` (`ixy` 0.6.1) for the identical reason.