hint that checkout has to be used first (#34)

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Sergey Nikitin 2021-09-28 15:03:51 +01:00 committed by GitHub
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@ -6,6 +6,8 @@ sensible defaults.
## Example usage
```yaml
- uses: actions/checkout@v2
# selecting a toolchain either by action or manual `rustup` calls should happen
# before the plugin, as it uses the current rustc version as its cache key
- uses: actions-rs/toolchain@v1