Mention `rustup self update` (fixes #3211)

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Manish Goregaokar 2018-09-22 14:35:11 -07:00 committed by GitHub
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@ -64,6 +64,8 @@ rustup component add clippy-preview
Now you can run Clippy by invoking `cargo clippy`.
If it says that it can't find the `clippy` subcommand, please run `rustup self update`
### Running Clippy from the command line without installing it
To have cargo compile your crate with Clippy without Clippy installation