chore: add engines field to package.json

README.md

@@ -18,14 +18,20 @@ Development
 ---
 Make sure [Node.js](https://nodejs.org/) greater than v8.0 is installed.
 ``` sh
+$ yarn
+$ yarn run dev
+# or
 $ npm i
 $ npm run dev
-# Then load the extension from 'dist/'.
 ```
+Then load the extension from 'dist/'.
 
 Build
 ---
 ``` sh
+$ yarn
+$ yarn run build
+# or
 $ npm i
 $ npm run build
 ```

package.json

@@ -72,5 +72,8 @@
     "tldjs": "^2.2.0",
     "vue": "^2.4.2",
     "vueleton": "^0.4.0"
+  },
+  "engines": {
+    "node": ">=8"
   }
 }