Bump shelljs from 0.7.8 to 0.8.2

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.7.8 to 0.8.2.
- [Release notes](https://github.com/shelljs/shelljs/releases)
- [Changelog](https://github.com/shelljs/shelljs/blob/master/CHANGELOG.md)
- [Commits](shelljs/shelljs@v0.7.8...v0.8.2)

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

package.json

@@ -64,7 +64,7 @@
     "react": "16.0.0",
     "react-dom": "16.0.0",
     "react-ga": "2.4.1",
-    "shelljs": "^0.7.8",
+    "shelljs": "^0.8.2",
     "shx": "^0.2.2",
     "snyk": "^1.78.1",
     "stylelint": "^8.4.0",