Release RcppCGAL 5.5.3

[ericdunipace]

Prepare for release:

• [x] git pull
• [x] Check current CRAN check results
• [x] Polish NEWS
• [x] urlchecker::url_check()
• [x] devtools::check(remote = TRUE, manual = TRUE)
• [x] devtools::check_win_devel()
• [x] devtools::check_win_release()
• [x] devtools::check_win_oldrelease()
• [x] out <- rhub::check_for_cran(show_status = FALSE)
• [x] revdepcheck::revdep_check(num_workers = 4,timeout = as.difftime(120, units = "mins"))
• [x] Update cran-comments.md
• [x] git push

Submit to CRAN:

• [x] usethis::use_version('patch')
• [x] devtools::submit_cran()
• [x] Approve email

Wait for CRAN...

• [x] Accepted :tada:
• [x] git push
• [x] usethis::use_github_release()
• [x] usethis::use_dev_version()
• [x] usethis::use_news_md()
• [x] git push

[ericdunipace]

This should fix issue #10