Balance suggestion for Cumans

- Huntables provide 20% more food.

I feel like Cumans are pretty good late game civ and this should address every problem that Cumans have in early age.

This would give them a good scout opening and fit with faster cavalry bonus they have.

Alternatively, their extra TC bonus would be justifiable if they have more food to pump out villager efficiently.

It makes sense from a historic point too as they were good nomadic hunters.