chore(deps-dev): bump nunjucks from 3.2.3 to 3.2.4 (#168)

Bumps [nunjucks](https://github.com/mozilla/nunjucks) from 3.2.3 to 3.2.4.
- [Release notes](https://github.com/mozilla/nunjucks/releases)
- [Changelog](https://github.com/mozilla/nunjucks/blob/master/CHANGELOG.md)
- [Commits](mozilla/nunjucks@v3.2.3...v3.2.4)

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

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package.json

@@ -31,7 +31,7 @@
     "fs-extra": "^6.0.1",
     "lodash": "^4.17.20",
     "mkdirp": "^1.0.4",
-    "nunjucks": "^3.2.2",
+    "nunjucks": "^3.2.4",
     "plantuml-encoder": "^1.4.0",
     "rimraf": "^2.7.1",
     "semver": "^6.3.0",