build(deps-dev): 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](https://github.com/shelljs/shelljs/compare/v0.7.8...v0.8.5)

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

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

package-lock.json

@@ -483,6 +483,17 @@
           "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.6.1.tgz",
           "integrity": "sha512-f85qBoQiqiFM/sCmJaN4Lagj9bqMcv38vCftqp4GfVessAqq3Ns6g+3gd8UXReStLLE/DGEdwiZXoFKxphKqwg==",
           "dev": true
+        },
+        "shelljs": {
+          "version": "0.7.8",
+          "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.7.8.tgz",
+          "integrity": "sha512-/YF5Uk8hcwi7ima04ppkbA4RaRMdPMBfwAvAf8sufYOxsJRtbdoBsT8vGvlb+799BrlGdYrd+oczIA2eN2JdWA==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.0.0",
+            "interpret": "^1.0.0",
+            "rechoir": "^0.6.2"
+          }
         }
       }
     },
@@ -19887,9 +19898,9 @@
       "dev": true
     },
     "shelljs": {
-      "version": "0.7.8",
+      "version": "0.8.5",
-      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.7.8.tgz",
+      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.8.5.tgz",
-      "integrity": "sha1-3svPh0sNHl+3LhSxZKloMEjprLM=",
+      "integrity": "sha512-TiwcRcrkhHvbrZbnRcFYMLl30Dfov3HKqzp5tO5b4pt6G/SezKcYhmDg15zXVBswHmctSAQKznqNW2LO5tTDow==",
       "dev": true,
       "requires": {
         "glob": "^7.0.0",

package.json

@@ -196,7 +196,7 @@
     "rollup-pluginutils": "^2.3.0",
     "selenium-server": "^3.0.1",
     "semver": "^5.4.1",
-    "shelljs": "^0.7.8",
+    "shelljs": "^0.8.5",
     "sinon": "^4.0.0",
     "sinon-chai": "^2.8.0",
     "stylus": "^0.54.5",