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Longer Barters: Dynasty Edition

If you would rather have 30 turn barters without researching them, please check out my other mod here:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3297099273

What this mod does:

• Changes the "Charm Offensive" technology to add +10 barter duration.
  
• Because this stacks with the "Renowned Traders" technology for Mesopotamian factions, that has been nerfed slightly to +5

Why did you do this?
In this update, the developers added a tech which can increase the duration of barters. So I decided to do a new version of my older mod, which, instead of just flat out giving you extra barters for nothing, provides that bonus through gameplay systems.

Result:
All factions can increase their barter agreements to 30 turns. The Mesopotamian factions, can increase barters to 35.