public static async Task<UserListDetailedCursored> GetListSubscribers(this ITwitterSession session, long listId,
string slug="", long ownerId = 0,
string ownerScreenName = "", long cursor = -1)
{
var parameters = new TwitterParametersCollection();
parameters.Create(skip_status:false, include_entities:true, cursor:cursor, list_id: listId, slug: slug, owner_id: ownerId, owner_screen_name: ownerScreenName);
return await session.GetAsync(TwitterApi.Resolve("/1.1/lists/subscribers.json"), parameters)
.ContinueWith(c => c.MapToSingle<UserListDetailedCursored>());
}