fix: upgrade vinyl from 2.2.0 to 2.2.1

Snyk has created this PR to upgrade vinyl from 2.2.0 to 2.2.1.

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

See this project in Snyk:
https://app.snyk.io/org/jorrit/project/4b6a3c4b-f6a9-4a3d-bbfe-dcee933d2bf0?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -12,7 +12,7 @@
     "event-stream": "^4.0.1",
     "plugin-error": "^1.0.1",
     "requirejs": "^2.3.6",
-    "vinyl": "^2.2.0"
+    "vinyl": "^2.2.1"
   },
   "devDependencies": {
     "coveralls": "^3.1.0",