History of Event::topic 1 change

In crates/hub/src/bus.rs, lines 87–94 on v0.9.6. 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 87,94:crates/hub/src/bus.rs.