Bump shelljs from 0.7.8 to 0.8.5

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]

package.json

@@ -116,7 +116,7 @@
     "pug-loader": "^2.3.0",
     "purify-css": "^1.2.6",
     "regenerator-runtime": "^0.13.2",
-    "shelljs": "^0.7.0",
+    "shelljs": "^0.8.5",
     "stylus": "^0.54.5",
     "stylus-loader": "^3.0.1",
     "transform-runtime": "^0.0.0",

yarn.lock

@@ -12642,15 +12642,6 @@ shell-quote@^1.7.3:
   resolved "https://registry.yarnpkg.com/shell-quote/-/shell-quote-1.7.4.tgz#33fe15dee71ab2a81fcbd3a52106c5cfb9fb75d8"
   integrity sha512-8o/QEhSSRb1a5i7TFR0iM4G16Z0vYB2OQVs4G3aAFXjn3T6yEx8AZxy1PgDF7I00LZHYA3WxaSYIf5e5sAX8Rw==
 
-shelljs@^0.7.0:
-  version "0.7.8"
-  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.8.tgz#decbcf874b0d1e5fb72e14b164a9683048e9acb3"
-  integrity sha512-/YF5Uk8hcwi7ima04ppkbA4RaRMdPMBfwAvAf8sufYOxsJRtbdoBsT8vGvlb+799BrlGdYrd+oczIA2eN2JdWA==
-  dependencies:
-    glob "^7.0.0"
-    interpret "^1.0.0"
-    rechoir "^0.6.2"
-
 shelljs@^0.8.5:
   version "0.8.5"
   resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.5.tgz#de055408d8361bed66c669d2f000538ced8ee20c"