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docs: correct unstable opts descr. in readme
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@calebcartwright
calebcartwright committed Jun 12, 2020
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Expand Up @@ -211,8 +211,11 @@ guide] that has been formalized through the [style RFC
process][fmt rfcs].

Configuration options are either stable or unstable. Stable options can always
be used, while unstable ones are only available on a nightly toolchain, and opt-in.
See [GitHub page](https://rust-lang.github.io/rustfmt/) for details.
be used on any channel. Unstable options are always available on nightly, but can only be used on stable and beta with an explicit opt-in (starting in Rustfmt v2.0).

Unstable options are not available on stable/beta with Rustfmt v1.x.

See the configuration documentation on the Rustfmt [GitHub page](https://rust-lang.github.io/rustfmt/) for details (look for the `unstable_features` section).

### Rust's Editions

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