BREAKING CHANGE: add Node engines field

Drop support for Node.js versions before 14

Author: ludofischer

package.json

@@ -1,6 +1,6 @@
 {
   "name": "postcss-calc",
-  "version": "8.2.4",
+  "version": "9.0.0",
   "description": "PostCSS plugin to reduce calc()",
   "keywords": [
     "css",
@@ -46,6 +46,9 @@
       "curly": "error"
     }
   },
+  "engines": {
+    "node": "^14 || ^16 || >=18.0"
+  },
   "devDependencies": {
     "@types/node": "^18.16.2",
     "eslint": "^8.39.0",