History of pg::key 1 change

In crates/hub/src/leader.rs, lines 251–254 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 251,254:crates/hub/src/leader.rs.