Added support for Steam error messages when calling GetEscrowDuration()
Added support for Steam error messages when calling GetEscrowDuration()

Update documentation for GetEscrowDuration() functions

novasdream/SteamBot,MattrAus/SteamBot,Jessecar96/SteamBot,terryhau/SteamBot,wqbill/SteamBot,MattrAus/SteamBot,icodingforfood/SteamBot,terryhau/SteamBot,fjch1997/SteamBot,fjch1997/SteamBot,novasdream/SteamBot,BlueRaja/SteamBot,icodingforfood/SteamBot,wqbill/SteamBot