fix: upgrade parse-gitignore from 0.4.0 to 0.5.1

Snyk has created this PR to upgrade parse-gitignore from 0.4.0 to 0.5.1.

See this package in npm:
https://www.npmjs.com/package/parse-gitignore

See this project in Snyk:
https://app.snyk.io/org/postman/project/a5c111c7-1bc9-4d89-849d-6732a81fc539?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -138,7 +138,7 @@
     "expect.js": "0.3.1",
     "nyc": "14.1.1",
     "mocha": "5.2.0",
-    "parse-gitignore": "0.4.0"
+    "parse-gitignore": "0.5.1"
   },
   "scripts": {
     "test": "./scripts/test.sh",