fix(nuxt-build): wait for use exit when running with --analyze flag

bin/nuxt-build

@@ -75,12 +75,20 @@ const builder = new Builder(nuxt)
 // Setup hooks
 nuxt.hook('error', (_err, from) => Utils.fatalError(_err, from))
 
+// Close function
+const close = () => {
+  if (options.build.analyze === true) {
+    return // Wait for user exit
+  }
+  process.exit(0)
+}
+
 if (options.mode !== 'spa') {
   // -- Build for SSR app --
   builder
     .build()
     .then(() => debug('Building done'))
-    .then(() => process.exit(0))
+    .then(() => close())
     .catch(err => {
       Utils.fatalError(err)
     })
@@ -110,6 +118,6 @@ if (options.mode !== 'spa') {
 
   // Generate dist for SPA static deployment
   new Generator(nuxt, builder).generate({ build: true }).then(() => {
-    process.exit(0)
+    close()
   })
 }