Bump pug from 2.0.3 to 3.0.1

Bumps [pug](https://github.com/pugjs/pug) from 2.0.3 to 3.0.1.
- [Release notes](https://github.com/pugjs/pug/releases)
- [Commits](https://github.com/pugjs/pug/compare/pug@2.0.3...pug@3.0.1)

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

package.json

@@ -44,7 +44,7 @@
     "karma-jasmine": "~1.1.2",
     "karma-jasmine-html-reporter": "^0.2.2",
     "protractor": "~5.4.0",
-    "pug": "^2.0.3",
+    "pug": "^3.0.1",
     "pug-loader": "^2.4.0",
     "ts-node": "~7.0.0",
     "tslint": "~5.11.0",