Release r2dii.plot 0.5.2

[cjyetman]

Prepare for release:

• git pull
• Check current CRAN check results
• Polish NEWS
• urlchecker::url_check()
• devtools::build_readme()
  • building the README on @cjyetman's machine always makes minor changes to the plots, but I think we should ignore these
• devtools::check(remote = TRUE, manual = TRUE)
• devtools::check_win_devel()
  • https://win-builder.r-project.org/LcEmcL5OdMR3/
• revdepcheck::revdep_check(num_workers = 4)

## revdepcheck results

We checked 2 reverse dependencies, comparing R CMD check results across CRAN and dev versions of this package.

 * We saw 0 new problems
 * We failed to check 1 packages

Issues with CRAN packages are summarised below.

### Failed to check

* pacta.loanbook (NA)

This version of r2dii.plot causes errors on current pacta.loanbook because of name changes of `market_share` and `sda` to `market_share_demo` and `sda_demo`. This is already addressed in https://github.com/RMI-PACTA/pacta.loanbook/pull/231 and will be released soon after this release.

• Update cran-comments.md
• git push

Submit to CRAN:

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

Wait for CRAN...

• Accepted 🎉
• usethis::use_github_release()
• usethis::use_dev_version(push = TRUE)