Update history.txt

Author: IllianiCBT

MekHQ/docs/history.txt

@@ -155,6 +155,8 @@ MEKHQ VERSION HISTORY:
 + PR #6557: Improved Display for in stock parts while salvaging
 + PR #6558: Show engine tonnage in parts-in-use table
 + PR #6562: Fixed Campaign Portrait Fallback; Updated Immersive Dialog Visuals
++ PR #6560: Fix for negative temporary prisoner capacity
++ PR #6561: Added Dedicated Skill Check Utility Class
 
 0.50.04 (2025-03-22 1600 UTC)
 + PR #5852: RAW CamOps Delivery Times