v0.5.1

<!-- Release notes generated using configuration in .github/release.yml at v0.5.1 -->

What's Changed

• Retry idempotent requests on ECONNRESET by @rianmcguirefly in https://github.com/superfly/fly-go/pull/226

Full Changelog: https://github.com/superfly/fly-go/compare/v0.5.0...v0.5.1