Update package.json

Author: coderyi

package.json

@@ -95,7 +95,7 @@
     "nightwatch": "^0.9.4",
     "phantomjs-prebuilt": "^2.1.7",
     "selenium-server": "2.53.1",
-    "serve": "^6.5.2",
+    "serve": ">=7.0.0",
     "sinon": "^1.17.4",
     "sinon-chai": "^2.8.0",
     "style-loader": "^0.13.1",