fix type check on electron-filestore package

Author: gingerbenw

packages/electron-filestore/package.json

@@ -10,6 +10,10 @@
     "type": "git",
     "url": "git@github.com:bugsnag/bugsnag-js.git"
   },
+  "files": [
+    "filestore.js",
+    "lib/minidump-io.js"
+  ],
   "publishConfig": {
     "access": "public"
   }