History of S3::creds 1 change

In crates/hub/src/backups.rs, lines 542–586 on v0.6.1. 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 542,586:crates/hub/src/backups.rs.