Bump pug from 2.0.4 to 3.0.1

Bumps [pug](https://github.com/pugjs/pug) from 2.0.4 to 3.0.1.
- [Release notes](https://github.com/pugjs/pug/releases)
- [Commits](https://github.com/pugjs/pug/compare/pug@2.0.4...pug@3.0.1)

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

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

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
     "md5": "^2.2.1",
     "mersenne-twister": "^1.1.0",
     "morgan": "~1.9.1",
-    "pug": "^2.0.4",
+    "pug": "^3.0.1",
     "uglify-js": "^2.6.0"
   }
 }