v0.2.0

Features

• unix: add AsUid, AsRawUid, AsGid and AsRawGid traits
• windows: add AsPsid and AsRawPsid traits

CI

• add initial github actions support

Documentation

• add badges to README.md

Refactor

• unix: seperate 'unix/mod.rs' and 'unix/tests.rs'
• replace LookupResult enum with Error enum
• Breaking: methods using LookupResult are converted to use Error

Full Changelog: v0.1.0...v0.2.0