example fix

Author: iyegoroff

CollapsibleHeaderViewsExample/package.json

@@ -3,6 +3,7 @@
   "version": "0.0.1",
   "private": true,
   "scripts": {
+    "preinstall": "cd .. && npm i --only=prod",
     "postinstall": "metro-with-symlinks",
     "build": "rm -rf build && tsc -p .",
     "lint": "tslint -p .",