R/qtl2 for R version 4

[Karl Broman]

R version 4 was released at https://cran.r-project.org.

I've built R/qtl2 binaries for R v4. When you upgrade R, update your R/qtl2 packages:

  update.packages(repos="https://rqtl.org/qtl2cran", ask=FALSE, checkBuilt=TRUE)

Or install again from scratch:

  install.packages("qtl2", repos="https://rqtl.org/qtl2cran")

karl