palette 0.0.3

• Adds lighten() and darkness() generic functions to lighten or darken colors.
• Corrects R dependency to R (>= 4.1.0).

palette 0.0.2

• Minor documentation fixes for CRAN resubmission.

palette 0.0.1

• Initial CRAN submission.
• Implements palette class with support for:
  • palette vectors can be plotted using plot().
  • palette vectors have pretty printing in the console.
  • palette vectors in tibbles have pillar methods for color display.
• Adds a palette_function() generator to use palettes within ggplot2 discrete scales.
• Implements testing with testthat and vdiffr.