History of Key::free 1 change

In crates/hub/src/throttle.rs, lines 51–56 on c8684d44d549e0c7c40f0202032904814d318fbb5e75df1c5624225a06dc7668. 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 51,56:crates/hub/src/throttle.rs.