load DictTree from json files.

def load(cls, path):
        """
        load DictTree from json files.
        """
        try:
            with open(path, "rb") as f:
                return cls(__data__=json.loads(f.read().decode("utf-8")))
        except:
            pass

        with open(path, "rb") as f:
            return cls(__data__=pickle.load(f))