## Resubmission
This is a resubmission. In this version we have:

Updated the package to version 0.8.5 and fixed minor bugs and typos to adjust the package code to R 4.0 devel (see NEWS.md).

## Test environments
* local ubuntu 18.04 R 3.6.0
* win-builder (release)
* travis Ubuntu 12.04.5 LTS 
* rhub

## R CMD check results
There were no ERRORs or WARNINGs. 

* Some examples use multiple cores but not more than 2.