Proposing we release artifacts-spec-1.0.0-rc.1
Account for issues and PRs tagged RC1

High-level deliverables as follows:

• Decide on main commit for release - 9ff738f
• Cut branch named v1.0.0-rc.1 based on agreed upon main commit
• Cut a tag named v1.0.0-rc.1
• Update README.md

/cc @SteveLasker, @michaelb990, @justincormack, @sajayantony

Can the maintainers please respond with a +1 comment once you are in favor of cutting this release.