build(deps): update debug requirement from 3.2.2 to 4.0.0

Updates the requirements on [debug](https://github.com/visionmedia/debug) to permit the latest version.
- [Release notes](https://github.com/visionmedia/debug/releases)
- [Changelog](https://github.com/visionmedia/debug/blob/master/CHANGELOG.md)
- [Commits](https://github.com/visionmedia/debug/commits/4.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -22,7 +22,7 @@
   "main": "./lib/index.js",
   "dependencies": {
     "boom": "7.2.0",
-    "debug": "3.2.2",
+    "debug": "4.0.0",
     "lodash": "4.17.10",
     "moment": "2.22.2"
   },