Update coverage-helper requirement from 0.1.0 to 0.2.0

Updates the requirements on [coverage-helper](https://github.com/taiki-e/coverage-helper) to permit the latest version.
- [Release notes](https://github.com/taiki-e/coverage-helper/releases)
- [Changelog](https://github.com/taiki-e/coverage-helper/blob/main/CHANGELOG.md)
- [Commits](taiki-e/coverage-helper@v0.1.0...v0.2.0)

---
updated-dependencies:
- dependency-name: coverage-helper
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -19,5 +19,5 @@ default = ["std"]
 std = ["dlv-list/std"]
 
 [dev-dependencies]
-coverage-helper = "0.1.0"
+coverage-helper = "0.2.0"
 serde_test = "1.0.144"