Bump debug from 2.6.9 to 3.1.0 (#627)

Bumps [debug](https://github.com/debug-js/debug) from 2.6.9 to 3.1.0.
- [Release notes](https://github.com/debug-js/debug/releases)
- [Changelog](https://github.com/debug-js/debug/blob/3.1.0/CHANGELOG.md)
- [Commits](debug-js/debug@2.6.9...3.1.0)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -56,7 +56,7 @@
     "compression": "^1.5.2",
     "cookie-session": "^2.0.0-alpha.1",
     "csurf": "^1.7.0",
-    "debug": "^2.2.0",
+    "debug": "^3.1.0",
     "eventemitter3": "^1.2.0",
     "express": "^4.14.0",
     "express-validator": "^2.20.8",