update package debug

Author: lagden

package.json

@@ -18,7 +18,7 @@
     "route"
   ],
   "dependencies": {
-    "debug": "^2.2.0",
+    "debug": "^3.1.0",
     "http-errors": "^1.3.1",
     "koa-compose": "^3.0.0",
     "methods": "^1.0.1",