Bump shelljs from 0.7.8 to 0.8.5 in /client

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.7.8 to 0.8.5.
- [Release notes](https://github.com/shelljs/shelljs/releases)
- [Changelog](https://github.com/shelljs/shelljs/blob/master/CHANGELOG.md)
- [Commits](shelljs/shelljs@v0.7.8...v0.8.5)

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

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

Author: dependabot[bot]

client/package-lock.json

@@ -53,7 +53,7 @@
     "ora": "^1.4.0",
     "rimraf": "^2.6.2",
     "semver": "^5.5.0",
-    "shelljs": "^0.7.8",
+    "shelljs": "^0.8.5",
     "url-loader": "^1.1.2",
     "vue-loader": "^11.1.4",
     "vue-style-loader": "^2.0.0",