Remove deprecated cfg_attr from README #3150
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`tool_attributes` are stable since 1.30. The old `cfg_attr(rustfmt, rustfmt_skip)` attributes aren't necessary anymore and everyone should switch to `#[rustfmt::skip]` sooner or later. There is also a Clippy lint in the making for this: rust-lang/rust-clippy#3123
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tool_attributesare stable since 1.30: Playground The oldcfg_attr(rustfmt, rustfmt_skip)attributes aren't necessary anymore and everyone should switch to#[rustfmt::skip]sooner or later.There is also a Clippy lint in the making for this: rust-lang/rust-clippy#3123