fix(package): update debug to version 4.1.1

Closes #69

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "coffeescript": "^2.3.1",
     "cors": "^2.8.4",
-    "debug": "^3.1.0",
+    "debug": "^4.1.1",
     "ejs": "^2.5.6",
     "express": "^4.15.3",
     "influx": "^5.0.7",