This is a small fix to support the next version of ggplot2.
The function new_data_frame was removed from ggplot2. It was replaced by an equivalent function
from from vctrs.
- local OS X install, R 4.2.1
- local ubuntu, R 3.6.3
- Windows (https://win-builder.r-project.org), R-devel
- There were no ERRORs, no WARNINGs and no NOTEs.