Update contributing instructions

`--all` argument to `cargo fmt` is not necessary, see rust-lang/rustfmt#3911
jplatte · Oct 25, 2021 · e9df5ba · e9df5ba
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commit e9df5ba
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -100,7 +100,7 @@ cargo test -p my-particular-crate
 To (re)format the Gloo source code, run:
 
 ```
-$ cargo fmt --all
+$ cargo fmt
 ```
 
 ### Updating `README.md`s