Release version 0.8.0 (#38)

Update version to 0.8.0 with
[cargo-release](https://github.com/crate-ci/cargo-release).
Merge this PR to build and publish a new release.

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: command-error-releng[bot]

Cargo.lock

@@ -3,7 +3,7 @@ resolver = "2"
 
 [package]
 name = "command-error"
-version = "0.7.0"
+version = "0.8.0"
 description = "Detailed error messages and status checking for `std::process::Command`"
 edition = "2021"
 license = "MIT"