Bump async-std from 1.6.5 to 1.7.0 (#306)

Bumps [async-std](https://github.com/async-rs/async-std) from 1.6.5 to 1.7.0.
- [Release notes](https://github.com/async-rs/async-std/releases)
- [Changelog](https://github.com/async-rs/async-std/blob/master/CHANGELOG.md)
- [Commits](async-rs/async-std@v1.6.5...v1.7.0)

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Co-authored-by: Bee <10378052+bee-san@users.noreply.github.com>

Author: dependabot-preview[bot]

Cargo.lock

@@ -19,7 +19,7 @@ exclude = [
 [dependencies]
 colored = "2.0.0"
 structopt = "0.3.20"
-async-std = "1.6.4"
+async-std = "1.7.0"
 futures = "0.3"
 rlimit = "0.5.2"
 shell-words = "1.0.0"