Test environments

local OS MS install, R 4.0.2
Continuous Integration
- Ubuntu Trusty 14.04 on travis-ci (devel and release)
- macOS on travis-ci (devel and release)
- Windows Server 2012 on appveyor (devel and release)
Rhub
- Windows Server 2008 R2 SP1, R-devel, 32/64 bit
- Ubuntu Linux 16.04 LTS, R-release, GCC
- Fedora Linux, R-devel, clang, gfortran
win-builder (devel and release)

R CMD check results

0 errors √ | 0 warnings √ | 0 notes √