v0.1.21

<!-- Release notes generated using configuration in .github/release.yml at v0.1.21 -->

What's Changed

• Add fields for virtual services by @jsierles in https://github.com/superfly/fly-go/pull/87
• Define type for release metadata by @gwuah in https://github.com/superfly/fly-go/pull/88

New Contributors

• @jsierles made their first contribution in https://github.com/superfly/fly-go/pull/87

Full Changelog: https://github.com/superfly/fly-go/compare/v0.1.19...v0.1.21