chore(package): update debug to version 2.4.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -43,7 +43,7 @@
     "compression": "1.6.2",
     "cookie-parser": "1.4.3",
     "cors": "2.8.1",
-    "debug": "^2.2.0",
+    "debug": "^2.4.1",
     "express": "4.14.0",
     "express-jwt": "5.1.0",
     "express-validation": "1.0.1",