Remove build logs in dev

lib/build.js

@@ -38,12 +38,7 @@ const r = function () {
   args = args.map(normalize)
   return wp(resolve.apply(null, args))
 }
-const webpackStats = {
+let webpackStats = 'none'
-  chunks: false,
-  children: false,
-  modules: false,
-  colors: true
-}
 // force green color
 debug.color = 2
 
@@ -96,6 +91,12 @@ export function options () {
   }
   // Production, create server-renderer
   if (!this.dev) {
+    webpackStats = {
+      chunks: false,
+      children: false,
+      modules: false,
+      colors: true
+    }
     const serverConfig = getWebpackServerConfig.call(this)
     const bundlePath = join(serverConfig.output.path, serverConfig.output.filename)
     if (fs.existsSync(bundlePath)) {