fix(package): update debug to version 4.0.1

Closes #18

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
     "compression": "^1.6.2",
     "dataloader": "^1.3.0",
     "date-fns": "^1.28.2",
-    "debug": "^2.6.3",
+    "debug": "^4.0.1",
     "decimal.js": "^7.2.0",
     "dotenv": "^4.0.0",
     "express": "^4.15.2",