doc: add 2021 edition to installation section
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@ -48,6 +48,7 @@ dependency in `Cargo.toml`.
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[package]
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[package]
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name = "my-crate"
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name = "my-crate"
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version = "0.1.0"
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version = "0.1.0"
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edition = "2021"
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authors = ["Me <user@rust-lang.org>"]
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authors = ["Me <user@rust-lang.org>"]
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[dependencies]
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[dependencies]
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