Release leaflet.extras 2.0.0

[trafficonese]

Prepare for release:

• Fix Google Search
• git pull
• Check current CRAN check results
• Polish NEWS
• urlchecker::url_check()
• devtools::build_readme()
• devtools::check(remote = TRUE, manual = TRUE)
• devtools::check_win_devel()
• revdepcheck::revdep_check(num_workers = 4)
• Update cran-comments.md
• git push
• Draft blog post

Submit to CRAN:

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

Wait for CRAN...

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

[trafficonese]

Version 2.0.0 has just been published to CRAN. 🎉

This release includes updates to most JavaScript libraries, various bug fixes, and new features. While it is a major version bump, it should not introduce any breaking changes. However, if you encounter any issues or new bugs, please feel free to file a new issue.