Tempo v0.0.6

What's Changed

• feat!: refactor credential API by @andrewmd5 in #24
• Refactor 'AuthContext' and 'ServerContext' by @andrewmd5 in #25

these are breaking changes - a client < 0.0.6 can no longer handle authentication from a 0.0.6+ server

Full Changelog: v0.0.5...v0.0.6