Update express

package.json

@@ -54,7 +54,7 @@
     "elasticsearch": "^12.1.3",
     "emojify.js": "^1.1.0",
     "errorhandler": "~1.3.4",
-    "express": "~4.14.0",
+    "express": "^4.15.2",
     "express-form": "~0.12.0",
     "express-session": "~1.14.0",
     "font-awesome": "~4.7.0",