This setting was added to match rustfmt, but it's been taking effect on
all file editing, which I notice most on git `COMMIT_EDITMSG`. I want to
keep my default 72-width commit messages, please. :)
Editorconfig is a lightweight specification that
helps maintaining consistent coding/formatting style
accross editors, especially those editors
that are not explicitly aware of Rust and rustfmt.
https://editorconfig.org/
