History of serve 4 changes

In crates/hub/src/lib.rs, lines 374–439 on v0.9.20. 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 374,439:crates/hub/src/lib.rs.