rustfmt.toml: init
When using rustic-mode + Emacs, saving in a file that has the async keyword
pops up an error box because the edition isn't specified for rustfmt itself.
Adding a rustfmt.toml file with edition = "2018" lets rustfmt know that the
codebase is indeed 2018-edition Rust.
Created by cole-h on November 16, 2020
HYRH4E55TIRBB3RFFR432METJPNVBSPL6DJVHXE5XGFGZAGBACDAC In channels
main
Change contents
File addition: rustfmt.toml
[1.0]edition = "2018"