Drop Node.js <20 support (#174)

.github/workflows/ci.yml

@@ -48,7 +48,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         node:
-          - 18
           - 20
           - 22
           - 24

package-lock.json

@@ -29,7 +29,7 @@
         "xo": "^1.2.3"
       },
       "engines": {
-        "node": ">=18"
+        "node": ">=20"
       }
     },
     "node_modules/@babel/code-frame": {

package.json

@@ -43,7 +43,7 @@
     "index.js"
   ],
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "dependencies": {
     "@xhmikosr/bin-wrapper": "^13.2.0",