Release discovr 0.1.5.7

[profandyfield]

First release:

• [x] usethis::use_cran_comments()
• [x] Proof read Title: and Description:
• [x] Check that all exported functions have @returns and @examples
• [x] Check that Authors@R: includes a copyright holder (role 'cph')
• [x] Check licensing of included files
• [x] Review https://github.com/DavisVaughan/extrachecks

Prepare for release:

• [ ] urlchecker::url_check()
• [ ] devtools::check(remote = TRUE, manual = TRUE)
• [ ] devtools::check_win_devel()
• [ ] rhub::check_for_cran()

Submit to CRAN:

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

Wait for CRAN...

• [ ] Accepted :tada:
• [ ] usethis::use_github_release()
• [ ] usethis::use_news_md()
• [ ] usethis::use_dev_version()
• [ ] Update install instructions in README