History of pg::Session::pid 1 change

In crates/hub/src/leader.rs, lines 324–326 on v0.6.1. 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 324,326:crates/hub/src/leader.rs.