chore(deps): 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/[email protected]@3.0.1)

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

Author: dependabot[bot]

Diff for: package.json

@@ -38,7 +38,7 @@
     "babel-preset-env": "^1.6.1",
     "conventional-changelog": "^1.1.24",
     "jest": "^22.4.2",
-    "pug": "^2.0.3",
+    "pug": "^3.0.1",
     "puppeteer": "^1.3.0",
     "rollup": "^0.58.2",
     "rollup-plugin-babel": "^3.0.4",
@@ -54,7 +54,7 @@
   },
   "optionalDependencies": {
     "less": "^3.9.0",
-    "pug": "^2.0.3",
+    "pug": "^3.0.1",
     "sass": "^1.18.0",
     "stylus": "^0.54.5"
   },