Minor fixes.
Added rmarkdown to Suggests to avoid being removed from CRAN.
Accepted to CRAN on 5/8/2021.
Fixed errors in examples.
Accepted to CRAN on 3/29/2020.
Changed default correlation function to power exponential, which we have found to be more numerically stable.
Accepted to CRAN on 6/16/2019.
First released version.
Accepted to CRAN on 6/13/2019.