Update debug version

Author: RMacfarlane

package.json

@@ -15,7 +15,7 @@
   "dependencies": {
     "body-parser": "~1.17.1",
     "cookie-parser": "~1.4.3",
-    "debug": "~2.6.3",
+    "debug": "~4.2.3",
     "express": "~4.15.2",
     "express-session": "^1.15.3",
     "hbs": "~4.0.1",