Preparing for update

1. usethis::use_release_issue() (adds checklist issue to GH)
2. Check current CRAN check results
3. Advance deprecation
4. Polish NEWS.md
5. urlchecker::url_check()
6. devtools::build_readme()
7. revdepcheck::revdep_check(num_workers = 4) (usethis::use_revdep())
8. Update cran-comments.md