Xamarin.Forms-Samples/HubTileCustomRender/packages/repositories.config

<?xml version="1.0" encoding="utf-8"?>
<repositories>
  <repository path="..\HubTileCustomRender\HubTileCustomRender.Droid\packages.config" />
  <repository path="..\HubTileCustomRender\HubTileCustomRender.iOS\packages.config" />
  <repository path="..\HubTileCustomRender\HubTileCustomRender.WinPhone\packages.config" />
  <repository path="..\HubTileCustomRender\HubTileCustomRender\packages.config" />
</repositories>