v0.1.43

<!-- Release notes generated using configuration in .github/release.yml at v0.1.43 -->

What's Changed

• Prune new auth tokens in advance by @wjordan in https://github.com/superfly/fly-go/pull/127
• machine_types: Add support for image volumes by @saleemrashid in https://github.com/superfly/fly-go/pull/148

Full Changelog: https://github.com/superfly/fly-go/compare/v0.1.42...v0.1.43