Fix photo album sample app not starting

Author: nirmaoz

samples/photo_album/package.json

@@ -44,7 +44,7 @@
     "sw-precache-webpack-plugin": "0.11.4",
     "url-loader": "0.6.2",
     "webpack": "3.8.1",
-    "webpack-dev-server": "3.1.11",
+    "webpack-dev-server": "3.0.0",
     "webpack-manifest-plugin": "1.3.2",
     "whatwg-fetch": "2.0.3"
   },