Release SomaDataIO 6.0.0 -> CRAN

[stufield]

First release:

• usethis::use_cran_comments()
• Update (aspirational) install instructions in README
• Proofread Title: and Description:
• Check that all exported functions have @return and @examples
• Check that Authors@R: includes a copyright holder (role 'cph')
• Check licensing of included files
• Review https://github.com/DavisVaughan/extrachecks

Prepare for release:

• git pull
• Check if any deprecation processes should be advanced, as described in Gradual deprecation
• devtools::build_readme()
• urlchecker::url_check()
• devtools::spell_check()
• devtools::check(remote = TRUE, manual = TRUE)
• devtools::check_win_devel()
• rhub::check_for_cran()
• rhub::check(platform = 'ubuntu-rchk')
• rhub::check_with_sanitizers()
• git push

Submit to CRAN:

• usethis::use_version('major')
• Update NEWS.md with CRAN v6.0.0 released!
• devtools::submit_cran()
• Approve email

Wait for CRAN...

• Accepted 🎉
• git push
• usethis::use_github_release()
  • cat(usethis:::news_latest(readLines("NEWS.md")))
• usethis::use_dev_version()
• git push to GitHub
• Tell everyone you know 🥳 🎉
• Update pkgdown

• See also #20