Release weathercan 0.6.0

[steffilazerte]

Prepare for release:

• [x] Check current CRAN check results
• [x] Polish NEWS
• [x] devtools::build_readme()
• [x] urlchecker::url_check()
• [x] devtools::check(remote = TRUE, manual = TRUE)
• [x] devtools::check_win_***()
  • [x] old release
  • [x] release
  • [x] devel
• [x] rhub::check_for_cran()
  • [x] debian-clang-devel
  • [x] debian-gcc-devel
  • [x] debian-gcc-patched
  • [x] debian-gcc-release
  • [x] fedora-clang-devel
  • [x] fedora-gcc-devel
  • [x] solaris-x86-patched1
• [x] revdepcheck::revdep_check(num_workers = 4)
• [x] Update cran-comments.md
• [x] Review pkgdown reference index for, e.g., missing topics

Submit to CRAN:

• [x] devtools::submit_cran()
• [x] Approve email

Wait for CRAN...

• [ ] Accepted :tada:
• [ ] usethis::use_github_release()
• [ ] usethis::use_dev_version()
• [ ] Tweet