fix: upgrade shelljs from 0.8.4 to 0.8.5

Snyk has created this PR to upgrade shelljs from 0.8.4 to 0.8.5.

See this package in npm:
https://www.npmjs.com/package/shelljs

See this project in Snyk:
https://app.snyk.io/org/postman/project/8519ba8e-6a7d-469a-88b3-7891b4c1c14e?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -28,7 +28,7 @@
     "async": "2.6.3",
     "path": "0.12.7",
     "postman-collection": "3.6.11",
-    "shelljs": "0.8.4"
+    "shelljs": "0.8.5"
   },
   "devDependencies": {
     "browserify": "14.5.0",