remove support for node 18

Author: deniak

.github/workflows/node.js.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
     steps:
       - name: Checkout
         uses: actions/checkout@v4

package.json

@@ -27,7 +27,7 @@
     "test": "mocha --timeout 20000"
   },
   "engines": {
-    "node": "18 || 20 || 22",
+    "node": "20 || 22",
     "npm": ">=7"
   }
 }