Premptively align the Node version requirement for PostCSS 8

This excludes Node.js 11.x and 13.x

Author: realityking

package.json

@@ -34,7 +34,7 @@
     "url": "https://github.com/mrjoelkemp/node-dependency-tree/issues"
   },
   "engines": {
-    "node": ">=10.13.0"
+    "node": "^10.13 || ^12 || >=14"
   },
   "homepage": "https://github.com/mrjoelkemp/node-dependency-tree",
   "dependencies": {