2.0
  - spell_check_package() now also checks README.md and NEWS.md in the package root
  - Enforce latest hunspell and libhunspell, which include updated dictionaries
  - Treat all input as UTF-8. Fixes some false positives on Windows
  - Ignore yaml front matter in markdown except for 'title', 'subtitle', and 'description'
  - Markdown: filter words that contain an '@' symbol (citation key or email address)
  - Properly parse authors@R field for ignore list (issue #2)
  - Use tools::file_ext instead of knitr:::file_ext

1.2
  - Internally normalize all case of lang strings to lower_UPPER e.g en_US
  - Only run automatic check when 'spelling' is available and NOT_CRAN is set

1.1
  - Breaking: Package spell-checker now uses language from DESCRIPTION
  - Require hunspell 2.9 dependency (better parsing and dicationaries)
  - Change default lang to 'en_US'

1.0
  - Initial release
