Prestige

[kung foo man]

And also "self.stats["xp"] = 0;" is not recommended way to do it as said in the readme.

What readme do you mean? Resetting xp/rank seems obvious, since they get a new prestige-icon for it.

I would add a stat like player.stats["prestige"] = 0; and increment it on each prestige while resetting xp/rank.