Bump rayon-core from 1.7.1 to 1.8.0

Bumps [rayon-core](https://github.com/rayon-rs/rayon) from 1.7.1 to 1.8.0.
- [Release notes](https://github.com/rayon-rs/rayon/releases)
- [Changelog](https://github.com/rayon-rs/rayon/blob/master/RELEASES.md)
- [Commits](rayon-rs/rayon@rayon-core-v1.7.1...rayon-core-v1.8.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

Cargo.lock

@@ -26,7 +26,7 @@ clap = { version = "2.33", default-features = false }
 tui = { version = "0.9", default-features = false, features = ['crossterm'] }
 bytesize = { version = "1.0.1", default-features = false}
 itertools = "0.9"
-rayon-core = "1.7"
+rayon-core = "1.8"
 log = "0.4"
 simplelog = { version = "0.8", default-features = false }
 dirs = "3.0"

Cargo.toml

@@ -14,7 +14,7 @@ keywords = ["git"]
 [dependencies]
 scopetime = { path = "../scopetime", version = "0.1" }
 git2 = { version = "0.13.10", default-features = false }
-rayon-core = "1.7"
+rayon-core = "1.8"
 crossbeam-channel = "0.4"
 log = "0.4"
 thiserror = "1.0"