update NEWS for 2.2.21

increment version to 2.2.16

increment version for typo patch

add cran-comments.md to appease new devtools::release()

Merge pull request swirldev#162 from swirldev/regmods

Add regression models to recommended courses

bug fixes and slight version increment

update DESCRIPTION

updated NEWS for release of 2.2.0

incremented version and documented bug fix in NEWS

updated DESCRIPTION to reflect bug fix -- increment version to 2.0.1