v0.6.0-preview3

What's Changed

• Bump version of main project by @agocke in #151
• Remove contravariance from ISerialize by @agocke in #152
• Fix benchmarking project by @agocke in #153
• Add exe proj for doing perf traces by @agocke in #154
• Fix pack by @agocke in #155

Full Changelog: v0.6.0-preview1...v0.6.0-preview3