History of ensure 1 change

In crates/hub/src/setup.rs, lines 19–39 on v0.9.1. 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 19,39:crates/hub/src/setup.rs.