Add function-no-unknown (#155)

Author: jeddy3

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 7.0.0
+
+- Removed: `stylelint` less than `14.4.0` from peer dependencies.
+- Added: `function-no-unknown` rule.
+
 ## 6.0.0
 
 - Removed: `stylelint` less than `14.0.0` from peer dependencies.

index.js

@@ -19,6 +19,7 @@ module.exports = {
 		'font-family-no-missing-generic-family-keyword': true,
 		'function-calc-no-unspaced-operator': true,
 		'function-linear-gradient-no-nonstandard-direction': true,
+		'function-no-unknown': true,
 		'keyframe-declaration-no-important': true,
 		'media-feature-name-no-unknown': true,
 		'named-grid-areas-no-invalid': true,