Bump pug from 2.0.4 to 3.0.3

Bumps [pug](https://github.com/pugjs/pug) from 2.0.4 to 3.0.3.
- [Release notes](https://github.com/pugjs/pug/releases)
- [Commits](https://github.com/pugjs/pug/compare/[email protected]@3.0.3)

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

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

Author: dependabot[bot]

package.json

@@ -42,7 +42,7 @@
     "markdown": "~0.5.0",
     "pdfjs-dist": "^2.4.456",
     "prettier": "1.19.1",
-    "pug": "^2.0.4",
+    "pug": "^3.0.3",
     "rollup": "^1.27.0",
     "rollup-plugin-babel": "^4.3.3",
     "rollup-plugin-cpy": "^2.0.1"