Update to stylelint-config-recommended@15

[jeddy3]

Just a heads up that we intend to change a few rules in our next release:
stylelint/stylelint-config-recommended#241

A few of the new rules are CSS-specific alternatives to existing ones. We suggest you continue using the existing rules in this config as they better support SCSS.

{
  "rules": {
   // ..
+ 'color-no-invalid-hex': true,
+ 'function-linear-gradient-no-nonstandard-direction': true,
+ 'unit-no-unknown': true,
+ 'string-no-newline': true,
+ 'at-rule-descriptor-no-unknown': null,
+ 'at-rule-descriptor-value-no-unknown': null,
+ 'at-rule-prelude-no-invalid': null,
+ 'declaration-property-value-no-unknown': null,
+ 'media-feature-name-value-no-unknown': null,
  }
}

[jeddy3]

FYI, we've released [email protected].