dandavison / delta / 5496581155

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Replace usage of the `atty` crate with `std::io::IsTerminal` trait (#1465)

Rust 1.70 stabilized the `IsTerminal` trait and the newest version of
`grep-cli` crate depending on it, makes it possible to remove the
unmaintained `atty` crate from the build.

```
Crate:     atty
Version:   0.2.14
Warning:   unsound
Title:     Potential unaligned read
Date:      2021-07-04
ID:        RUSTSEC-2021-0145
URL:       https://rustsec.org/advisories/RUSTSEC-2021-0145
```

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