build(deps): bump lodash from 4.17.11 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.11 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.11...4.17.21)

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

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

package.json

@@ -13,7 +13,7 @@
     "axios": "^0.18.0",
     "express": "^4.16.3",
     "highlight.js": "^9.12.0",
-    "lodash": "^4.17.10",
+    "lodash": "^4.17.21",
     "newrelic": "^4.6.0",
     "normalize.css": "^8.0.0",
     "nuxt": "^2.1.0",