optimum_credo v0.2.0

We added 6 new Credo checks to optimum_credo: unused types, private function specs, verbose nil assertions, extractable spec types, module organization, and documentation formatting.

## 0.2.0 (2026-03-13)

- Added 6 new readability checks: `DocumentationFormatting`, `ExtractableSpecTypes`, `ModuleOrganization`, `PrivateFunctionSpecs`, `UnusedTypes`, and `VerboseAssertions`.
- Fixed Elixir 1.19 compatibility by upgrading Credo to 1.7.17.

https://hex.pm/packages/optimum_credo