Bump shelljs from 0.2.6 to 0.8.5

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.2.6 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/v0.2.6...v0.8.5)

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

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

package.json

@@ -14,7 +14,7 @@
     "karma": "^2.0.4",
     "karma-junit-reporter": "^0.2.2",
     "protractor": "^5.3.2",
-    "shelljs": "^0.2.6",
+    "shelljs": "^0.8.5",
     "webpack-cli": "^3.0.8"
   },
   "scripts": {