Go full ES2015 in example

Author: nikku

example/src/header.html

@@ -11,7 +11,7 @@ <h1>{{ salutation }}, counted to {{ count }} already!</h1>
       }
     },
     computed: {
-      salutation: function(dude) {
+      salutation(dude) {
         return hello(dude);
       }
     }

example/webpack.config.js

@@ -18,7 +18,7 @@ module.exports = {
   module: {
     rules: [
       {
-        test: /\.(js)$/,
+        test: /\.(html|js)$/,
         exclude: /node_modules/,
         use: 'babel-loader',
         query: babelSettings