fix(package): update debug to version 4.1.1

Closes #5

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "semantic-release": "semantic-release pre && npm publish && semantic-release post"
   },
   "dependencies": {
-    "debug": "^2.6.4",
+    "debug": "^4.1.1",
     "lodash": "^4.17.4"
   },
   "devDependencies": {