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](shelljs/shelljs@v0.7.7...v0.8.5)

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

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

Author: dependabot[bot]

package.json

@@ -39,7 +39,7 @@
     "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": "^11.3.4",
     "vue-style-loader": "^2.0.5",

yarn.lock

@@ -3455,9 +3455,9 @@ sha.js@^2.4.0, sha.js@^2.4.8:
   dependencies:
     inherits "^2.0.1"
 
-shelljs@^0.7.6:
-  version "0.7.7"
-  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.7.tgz#b2f5c77ef97148f4b4f6e22682e10bba8667cff1"
+shelljs@^0.8.5:
+  version "0.8.5"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.5.tgz#de055408d8361bed66c669d2f000538ced8ee20c"
   dependencies:
     glob "^7.0.0"
     interpret "^1.0.0"