v2.4.18

Notable changes:

• stylelint 17.16.0, changelog
• fixes for color picker in editor by @Pharex38:
  • accept plain numbers for hsl/hwb saturation and lightness
  • fix deg/grad hue units and none in 2nd/3rd component
  • don't carry percent/none flags into another format
• fix UserCSS installation/editing/sync in WebKit-based browsers by @ubeann

Full Changelog: v2.4.17...v2.4.18