public Worker(string id, int workers, IDataSource io)
        {
            _id = id;
            _io = io;

            _workers = workers;
            _api     = new WikidataQuery();
        }
 static void Main(string[] args)
 {
     _api = new WikidataQuery();
     categories.AsParallel().ForAll(k => ReadAllCategories(k.Key, k.Value));
 }