Update history.txt

Author: rjhancock

MekHQ/docs/history.txt

@@ -146,6 +146,7 @@ MEKHQ VERSION HISTORY:
 + PR #6539: Added "Glass Jaw" SPA
 + PR #6505: Refactored Advanced Medical Edit Injury Dialog To Improve Error Handling
 + 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 
 
 0.50.04 (2025-03-22 1600 UTC)
 + PR #5852: RAW CamOps Delivery Times