Release torch 0.12.0

[dfalbel]

Prepare for release:

• [x] git pull
• [x] Check current CRAN check results
• [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
• [ ] Create the cran/ branch and update the branch variable
• [ ] Uncomment the indicated line in the .RBuildignore file

Submit to CRAN:

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

Wait for CRAN...

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