fix(package): update helmet to version 3.6.0

package.json

@@ -188,7 +188,7 @@
     "express": "4.15.2",
     "extract-text-webpack-plugin": "1.0.1",
     "fastclick": "1.0.6",
-    "helmet": "3.5.0",
+    "helmet": "3.6.0",
     "humps": "2.0.0",
     "isomorphic-fetch": "2.2.1",
     "jed": "1.1.1",