Drop node < 18, unblocks 'Floating Dependencies' on #414

Author: NullVoxPopuli

README.md

@@ -11,7 +11,7 @@ If you add build metadata to the version, this addon will automatically append S
 
 - Ember.js v3.28 or above
 - Ember CLI v3.28 or above
-- Node.js v14 or above
+- Node.js v18 or above
 
 ## Installation
 

package.json

@@ -79,7 +79,7 @@
     "ember-source": "^3.28.0 || >= 4.0.0"
   },
   "engines": {
-    "node": "14.* || 16.* || >= 18"
+    "node": ">= 18"
   },
   "publishConfig": {
     "registry": "https://registry.npmjs.org"