This is an update of the cytometree package to fix errors in R 4.0.0 checks

Test environments

local macOS 10.15.1 install, R 3.6.1
macOS 10.13.3 (on travis-ci), R release
ubuntu 16.04.6 (on travis-ci), R devel and release
Windows Visual Studio 2015 (on appveyor), R devel and release

R CMD check results

0 ERRORs | 0 WARNINGs | 0 NOTEs

Reverse dependencies

There are no reverse dependencies.

Thanks, Boris Hejblum