Update history.txt

megamek/docs/history.txt

@@ -79,6 +79,7 @@ MEGAMEK VERSION HISTORY:
 + PR #5841: FighterSquadron updates
 + PR #5846: Index guard for turn lookup to prevent error messages
 + Fix #5587: Check if Edge is enabled in Game Options before using it
++ PR #5859: Use OptionsConstants instead of hard-coded strings
 
 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,