Init the stats history (dict of GlancesAttribute).

def init_stats_history(self):
        """Init the stats history (dict of GlancesAttribute)."""
        if self.history_enable():
            init_list = [a['name'] for a in self.get_items_history_list()]
            logger.debug("Stats history activated for plugin {} (items: {})".format(self.plugin_name, init_list))
        return GlancesHistory()