Update history.txt

megamek/docs/history.txt

@@ -68,13 +68,15 @@ MEGAMEK VERSION HISTORY:
 + Fix #5818: correct issue with minimap autodisplay using wrong function
 + PR #5822: Implement RFE 5361: enhance Princess handling of hazardous terrain
 + Issues #2577, #897, #353: Implement placeable/carryable cargo objects (for mechs and protomechs only at the moment) (Carry Objects #5706)
++ PR #5839: The Heavy Lifter pilot ability is now implemented
 + Fix #5811, #5831: Updates to unit validation (Heavy Gauss Rifles and RISC Hyper Laser vs. engines), allow Illegal Design quirk to validate illegal units
 + Fix #5769:  Possibly fix ID overlap when reinforcing from MUL
 + PR #5835: Allow bot vs bot in ScenarioV2 and test setup
 + Fix #5833: GameReports: remove error message and deal with missing rounds
 + Fix #5833: Precognition: receive updated ground objects
 + Fix #5825: ASF Low Altitude LOS, levels, and ground map terrain blocking
 
+
 0.49.20 (2024-06-28 2100 UTC) (THIS IS THE LAST VERSION TO SUPPORT JAVA 11)
 + PR #5281, #5327, #5308, #5336, #5318, #5383, #5369, #5384, #5455, #5505, #5541: Code internals: preparatory work for supporting game types such as SBF, code cleanup for string drawing, superclass change for BoardView,
      Keydispatcher aka MegaMekController simplification, moving BoardView shadowmap creation to its own class, BoardView subclassing, DialogOptionsListener update