History of Config::roles 2 changes

In crates/hub/src/config.rs, lines 595–597 on v0.9.15. 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 595,597:crates/hub/src/config.rs.