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.

crayon v1.5.2

• crayon functions now mark their output with the right encoding,
  if their input was marked (#136, #138).

v1.5.1

• crayon now does not fail to install from source if the utils package
  is not loaded (#133).

v1.5.0

• You can use the new cli.default_num_colors option to set the default
  number of ANSI colors, only if ANSI support is otherwise detected.
  See the details in the manual of num_ansi_colors(). (From cli.)

• crayon now install cleanly on R 3.4.x and R 3.5.x on Windows (#131).

v.1.4.2

• Better ANSI support detection if there is an active sink().

• Support ANSI markup in RStudio jobs.

v1.4.1

• ANSI color support detection works correctly now in older RStudio (#112).

• ANSI color support detection works correctly now on older R versions
  (#109).

v1.4.0

• Overhauled and much improved detection of ANSI color support and
  number of ANSI colors.

• NO_COLOR environment variable disables color (#64)

• Now colors are turned on if ANSICON (https://github.com/adoxa/ansicon)
  is active.

• New hyperlink() function to add hyperlinks to terminal output.
  The new has_hyperlink() function tests if the current stdout()
  supports this.

• reset style now restores previous style for text following it (@brodieG,
  #35).

• Warnings are no longer generated when the INSIDE_EMACS environment variable is
  set but does not include a version number.