fix: with-feathers not startup with listening 3000

examples/with-feathers/src/middleware/nuxt.js

@@ -12,7 +12,7 @@ config.dev = process.env.NODE_ENV !== 'production'
 const nuxt = new Nuxt(config)
 if (config.dev) {
   const builder = new Builder(nuxt)
-  builder.build()
+  builder.build().then(() => process.emit('nuxt:build:done'))
 } else {
   process.nextTick(() => process.emit('nuxt:build:done'))
 }