Travis CI - Clippy Documentation

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# Travis CI

You can add Clippy to Travis CI in the same way you use it locally:

    language: rust
    rust:
      - stable
      - beta
    before_script:
      - rustup component add clippy
    script:
      - cargo clippy
      # if you want the build job to fail when encountering warnings, use
      - cargo clippy -- -D warnings
      # in order to also check tests and non-default crate features, use
      - cargo clippy --all-targets --all-features -- -D warnings
      - cargo test
      # etc.