Please ensure the following before submitting a PR:
if suggesting code changes or improvements, open an issue first
for all but trivial changes (e.g., typo fixes), add your name to DESCRIPTION
for all but trivial changes (e.g., typo fixes), documentation your change in NEWS.md with a parenthetical reference to the issue number being addressed
if changing documentation, edit files in /R not /man and run devtools::document() to update documentation
add code or new test files to /tests for any new functionality or bug fix
make sure R CMD check runs without error before submitting the PR