Release textshaping 0.4.0

[thomasp85]

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] 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
• [ ] rhub::check_on_solaris(env_vars = c("_R_CHECK_FORCE_SUGGESTS_" = "false"))
• [ ] rhub::check_with_valgrind(env_vars = c(VALGRIND_OPTS = "--leak-check=full --track-origins=yes"))

Submit to CRAN:

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

Wait for CRAN...

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