CONTRIBUTING.md: Updating deprecated rustfmt-preview #4645
Merged
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Rust has deprecated the
rustfmt-preview
with therustfmt
component.rustup
understands thatrustfmt-preview
is now justrustfmt
and checks for that instead, but we could still just update this to the new command.https://blog.rust-lang.org/2018/02/15/Rust-1.24.html