Release gargle 1.5.0

[jennybc]

Prepare for release:

• [x] git pull
• [x] Check current CRAN check results
• [x] Check if any deprecation processes should be advanced, as described in Gradual deprecation
• [x] Bump required R version in DESCRIPTION to 3.6
• [x] Polish NEWS
• [x] urlchecker::url_check()
• [x] devtools::build_readme()
• [x] devtools::check(remote = TRUE, manual = TRUE)
• [x] devtools::check_win_devel()
• [x] revdepcheck::cloud_check()
• [x] Update cran-comments.md
• [x] git push
• [ ] Draft blog post
• [ ] Slack link to draft blog in #open-source-comms

Submit to CRAN:

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

Wait for CRAN...

• [x] Accepted :tada:
• [ ] Add preemptive link to blog post in pkgdown news menu
• [x] usethis::use_github_release()
• [x] usethis::use_dev_version(push = TRUE)
• [ ] Finish blog post
• [ ] Tweet

[jennybc]

urlchecker gives 2 false positives:

> urlchecker::url_check()
✖ Error: vignettes/gargle-auth-in-client-package.Rmd:125:19 Error: Failed to connect to localhost port 80 after 11 ms: Connection refused
#> redirect_uris: http://localhost
                  ^~~~~~~~~~~~~~~~
✖ Error: vignettes/troubleshooting.Rmd:234:15 404: Not Found
  base_url = "https://www.googleapis.com"
              ^~~~~~~~~~~~~~~~~~~~~~~~~~

The first (http://localhost) is in a code comment (commented output). The second https://www.googleapis.com is in actual code.

Will be interesting to see if they show up in check_win_devel().

Update: no, these were not reported by check_win_devel(), suggesting there's some difference between CRAN's actual checks and what urlchecker is doing right now.