Bump shelljs from 0.7.7 to 0.8.5

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.7.7 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/v0.7.7...v0.8.5)

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

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

package.json

@@ -43,7 +43,7 @@
     "ora": "^1.2.0",
     "rimraf": "^2.6.0",
     "semver": "^5.3.0",
-    "shelljs": "^0.7.6",
+    "shelljs": "^0.8.5",
     "url-loader": "^0.5.8",
     "vue-loader": "^12.1.0",
     "vue-style-loader": "^3.0.1",