Test environments local Windows 10.1 x86_64, R 3.5.1 Ubuntu 14.04 (on travis-ci), R 3.4, release MacOS 10.12 (on travis-ci), R 3.4, release Windows (on appveyor), R 3.5.1 R CMD check results There were no errors and warnings. Submission History version 0.2.: This is the first submission of this package.