Remove incorrect version info

coreutils don't build on 1.20.0 anymore because `join` uses `?` for `Option`.
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equal-l2 2018-03-30 02:17:36 +09:00 committed by GitHub
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commit d6c5767b42
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@ -35,9 +35,7 @@ Requirements
### Rust Version ###
uutils follows Rust's release channels and is tested against stable, beta and nightly.
The current oldest supported version of the Rust compiler is `1.22.0`, but `1.20.0` is
known to work as well (test failures when compiling with `1.20.0` are due to the tests
themselves being broken by a change in the compiler).
The current oldest supported version of the Rust compiler is `1.22.0`.
On both Windows and Redox, only the nightly version is tested currently.