Release bcdata 0.3.0

[ateucher]

The BC Data Catalogue is getting an update, to be released on Oct 27, 2021. bcdata 0.3.0 (#283) will be compatible with the new catalogue, and will be released concurrently or immediately after.

Prepare for release:

• [x] Check current CRAN check results
• [x] Polish NEWS
• [x] devtools::build_readme()
• [x] urlchecker::url_check()
• [x] Ensure new catalogue is live
• [x] Comment out dev API endpoints in tests/testthat/setup.R
• [x] Merge #283
• [x] devtools::check(remote = TRUE, manual = TRUE)
• [x] devtools::check_win_devel()
• [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] usethis::use_version('minor')
• [x] devtools::submit_cran()
• [x] Approve email

Wait for CRAN...

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