Merge pull request #1672 from mozilla/greenkeeper/express-4.14.1

Update express to the latest version 🚀

package.json

@@ -164,7 +164,7 @@
     "deep-eql": "2.0.1",
     "dompurify": "0.8.5",
     "es6-error": "4.0.1",
-    "express": "4.14.0",
+    "express": "4.14.1",
     "extract-text-webpack-plugin": "1.0.1",
     "helmet": "3.4.0",
     "humps": "2.0.0",