crayon 1.5.3

• The semantics of the cli.default_num_colors options is now different.
  It is now used as the default number of colors if the number of colors
  is not already set by the cli.num_colors option, the R_CLI_NUM_COLORS
  environment variable, the crayon.enabled and crayon.colors options,
  the NO_COLOR environment variable, the knitr.in.progress option,
  or a sink() call for the stream. This matches the behavior of the cli
  package.