fix(package): update debug to version 4.0.1

Closes #12

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "lint:test": "eslint test"
   },
   "dependencies": {
-    "debug": "^3.1.0",
+    "debug": "^4.0.1",
     "ioredis": "^4.0.0",
     "uuid": "^3.3.2"
   },