use node 16 with npm 8

Author: lukasvice

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
           prerelease: false
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: '16.x'
           registry-url: 'https://registry.npmjs.org'
       - run: npm install
       - run: npm publish

package.json

@@ -13,6 +13,10 @@
   "main": "dist/index.js",
   "module": "dist/esm/index.js",
   "typings": "dist/index.d.ts",
+  "engines": {
+    "npm": "^8",
+    "node": "^16"
+  },
   "scripts": {
     "build": "npm run build:node && npm run build:esm",
     "build:node": "tsc",