Update assert_cmd requirement from 0.12 to 1.0 (#94)

Updates the requirements on [assert_cmd](https://github.com/assert-rs/assert_cmd) to permit the latest version.
- [Release notes](https://github.com/assert-rs/assert_cmd/releases)
- [Changelog](https://github.com/assert-rs/assert_cmd/blob/master/CHANGELOG.md)
- [Commits](https://github.com/assert-rs/assert_cmd/compare/v0.12.0...v1.0.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Cargo.toml

@@ -46,7 +46,7 @@ unicode-width = "0.1.7"
 winapi = "0.3.8"
 
 [dev-dependencies]
-assert_cmd = "0.12"
+assert_cmd = "1.0"
 predicates = "1"
 
 [package.metadata.deb]