Upgrade Node to at least 16

Author: ggrossetie

.github/workflows/build.yml

@@ -8,8 +8,8 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - 12.x
-          - 14.x
+          - 18
+          - 19
     steps:
     - uses: actions/checkout@v3
     - name: Set up Node ${{ matrix.node-version }}

package.json

@@ -4,8 +4,8 @@
   "description": "The Command Line Interface (CLI) for Asciidoctor.js",
   "main": "lib/cli.js",
   "engines": {
-    "node": ">=8.11",
-    "npm": ">=5.0.0"
+    "node": ">=16",
+    "npm": ">=8.0.0"
   },
   "files": [
     "bin",