Install webpack-dev-server

package.json

 {
   "name": "feather",
   "version": "0.0.0",
+  "scripts": {
+    "dev": "webpack-dev-server"
+  },
   "devDependencies": {
     "babel-core": "^6.22.1",
     "babel-loader": "^6.2.10",
@@ -9,6 +12,7 @@
     "vue": "^2.1.10",
     "vue-loader": "^10.1.2",
     "vue-template-compiler": "^2.1.10",
-    "webpack": "^2.2.0"
+    "webpack": "^2.2.0",
+    "webpack-dev-server": "^1.16.2"
   }
 }