Add missing vinyl dependency

Author: Anand Thakker

package.json

@@ -40,6 +40,7 @@
     "vfile": "^1.1.2",
     "vfile-reporter": "^1.4.1",
     "vfile-sort": "^1.0.0",
+    "vinyl": "^1.1.0",
     "vinyl-fs": "^1.0.0",
     "yargs": "^3.31.0"
   },