chore(package): update @types/debug to version 4.1.0

Closes #13

Author: greenkeeper[bot]

Diff for: package.json

@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "@types/chai": "^4.0.4",
-    "@types/debug": "^0.0.30",
+    "@types/debug": "^4.1.0",
     "@types/express": "^4.0.39",
     "@types/minio": "^7.0.1",
     "@types/mocha": "^5.0.0",