BREAKING CHANGE(grabber): add node version restriction as >= 12.18.0

Author: SilentDepth

package.json

@@ -3,6 +3,9 @@
   "version": "2.1.0",
   "description": "Web Stats for NyaaCat",
   "main": "index.js",
+  "engines": {
+    "node": ">=12.18.0"
+  },
   "directories": {
     "test": "test"
   },