v1.6.1

• Removed support for item announcement-based polling for node-steam.
  • This still works for node-steam-user.
  • This was modifying the prototype, and was therefore causing problems.
  • It also wasn't properly checking if the object passed into steam was a node-steam SteamUser or a node-steam-user SteamUser.
  • Thanks to @kinsi55 for reporting this.