History of Colour::class 1 change

In crates/hub/src/diffusion.rs, lines 433–442 on adbc38e7ea09d65e35433f0b506609ad0cde3ff0fa2aebfb9e4d28a2e02181c3. 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.