update README.md

sbdchd · Mar 13, 2022 · d6c8b66 · d6c8b66
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diff --git a/README.md b/README.md
@@ -442,6 +442,9 @@ that caused Neoformat to be invoked.
     [`rubocop`](https://github.com/bbatsov/rubocop)
 - Rust
   - [`rustfmt`](https://github.com/rust-lang-nursery/rustfmt)
+    ```vim
+    let g:rustfmt_edition_opt="2021"
+    ```
 - Sass
   - [`sass-convert`](http://sass-lang.com/documentation/#executables),
     [`stylelint`](https://stylelint.io/),