Update CONTRIBUTING.md

Since a13a33c33b049a7b412f0cc80a7b166b0d58345c code is rejected during CI if `rustfmt` complains. Update the docs regarding that fact.
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lukaslueg 2018-03-19 19:40:39 +01:00 committed by GitHub
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@ -81,6 +81,10 @@ of helpers to minimize boilerplate.
installed locally, ignore the cross-compile test failures or disable them by
using `CFG_DISABLE_CROSS_TESTS=1 cargo test`. Note that some tests are enabled
only on `nightly` toolchain. If you can, test both toolchains.
* All code is expected to comply with the formatting suggested by `rustfmt`;
discrepancy is considered an error by CI, so a pull request with unsound
formatting will not be accepted. You can use `rustup component add rustfmt-preview`
to install `rustfmt` and use `cargo fmt` to automatically format your code.
* Push your commits to GitHub and create a pull request against Cargo's
`master` branch.