Bump shelljs from 0.8.4 to 0.8.5

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.8.4 to 0.8.5.
- [Release notes](https://github.com/shelljs/shelljs/releases)
- [Changelog](https://github.com/shelljs/shelljs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/shelljs/shelljs/compare/v0.8.4...v0.8.5)

---
updated-dependencies:
- dependency-name: shelljs
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -62,7 +62,7 @@
     "raw-loader": "4.0.2",
     "sass-loader": "^12.4.0",
     "shell-quote": "^1.7.3",
-    "shelljs": "0.8.4",
+    "shelljs": "0.8.5",
     "slugify": "^1.6.5",
     "sortablejs": "^1.14.0",
     "source-code-pro": "^2.38.0",