Bump pug from 2.0.4 to 3.0.0

Bumps [pug](https://github.com/pugjs/pug) from 2.0.4 to 3.0.0.
- [Release notes](https://github.com/pugjs/pug/releases)
- [Commits](https://github.com/pugjs/pug/compare/pug@2.0.4...pug@3.0.0)

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

Author: dependabot[bot]

package.json

@@ -43,7 +43,7 @@
     "express-force-ssl": "^0.3.2",
     "helmet": "^3.21.1",
     "json-pointer": "^0.6.0",
-    "pug": "^2.0.4",
+    "pug": "^3.0.0",
     "socket.io": "^2.3.0",
     "websocket": "^1.0.30"
   },