History of Colour::class 1 change

In crates/hub/src/diffusion.rs, lines 433–442 on ac689cd21adf10d5e791fe3251ff8a1e91fde2a093ab579cb467aa1ab9a2edc0. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 433,442:crates/hub/src/diffusion.rs.