History of plural 1 change

In src/cli/format.rs, lines 19–21 on 36e51aa806c69ece6701da9debb1bf95a6a7fa3ba93e5be3cb6f2992359bf6e7. 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 19,21:src/cli/format.rs.