fix(package): update debug to version 4.0.0

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
     "conventional-changelog-angular": "^5.0.0",
     "conventional-commits-filter": "^2.0.0",
     "conventional-commits-parser": "^3.0.0",
-    "debug": "^3.1.0",
+    "debug": "^4.0.0",
     "import-from": "^2.1.0",
     "lodash": "^4.17.4"
   },