chore(package): update express-winston to version 2.1.2

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -47,7 +47,7 @@
     "express": "4.14.0",
     "express-jwt": "5.1.0",
     "express-validation": "1.0.1",
-    "express-winston": "2.1.0",
+    "express-winston": "2.1.2",
     "helmet": "3.1.0",
     "http-status": "^0.2.0",
     "joi": "10.0.6",