chore(package): update @types/debug to version 4.1.5

Closes #69

Author: greenkeeper[bot]

package.json

@@ -77,7 +77,7 @@
   },
   "devDependencies": {
     "@types/chai": "4.1.7",
-    "@types/debug": "0.0.31",
+    "@types/debug": "4.1.5",
     "@types/download": "6.2.3",
     "@types/express": "4.16.0",
     "@types/fs-extra": "5.0.4",