Update history.txt

Author: IllianiCBT

MekHQ/docs/history.txt

@@ -148,6 +148,7 @@ MEKHQ VERSION HISTORY:
 + PR #6540: Added AToW Wealth, Connections, Unlucky*, and Reputation Traits; Combat Sense, and Combat Paralysis SPAs; Integrated These Into CamOps Reputation 
 + PR #6552: Added ATOW Attribute Tracking and Utility Methods
 + PR #6551: Fixed Inability to GM Activate Self-Crewed Units (such as DropShips)
++ PR #6553: Rebranded "Intelligence" as "Reasoning" to Avoid Confusion with ATOW Intelligence Attribute
 
 0.50.04 (2025-03-22 1600 UTC)
 + PR #5852: RAW CamOps Delivery Times