Checklist for publishing

1. Update CHANGELOG.md with changes per Keep a Changelog format
2. Update documentation in website/docs and website/versioned_docs
3. Run yarn lerna version [major|minor|patch|prerelease] (this automatically runs the version script in ./package.json before committing and tagging)
4. Run yarn lerna publish from-git (with --dist-tag next if version was prerelease in previous step)