Issue installing CVXR

[Yonghyun Kwon]

When I try to install CVXR in R 3.5.0, it gives me the following error:

install.packages("CVXR", repos="http://cran.r-project.org")
...
Error : objects ‘hcl.colors’, ‘palette.colors’ are not exported by 'namespace:grDevices'
ERROR: lazy loading failed for package ‘CVXR’

• removing ‘/statl_est_machine/home/yhkwon/R/x86_64-pc-linux-gnu-library/3.5/CVXR’

The downloaded source packages are in
‘/tmp/Rtmp70dY5G/downloaded_packages’
Warning message:
In install.packages("CVXR", repos = "http://cran.r-project.org") :
installation of package ‘CVXR’ had non-zero exit status

Maybe the minimal version should be increased to R 3.6.0.

Related issue can be found on the following URL:
riatelab/mapsf#4