Add the grenade radius buff to the changelog

[TheDonkified]

Summary (a quick, 2-3 sentence summary):
Put the grenade radius buff in the changelog

Benefits (How this will benefit the server and game as a whole):
No more grenade FF because people don't know that the grenades were buffed (specifically people who have played when grenades had a smaller radius but not when the radius was buffed)

Details (Description of how you think this would work, the benefits, etc):
summary and title

Implementation (Optional, if you have an idea how to implement it):
n/a

[dylanstrategie]

Will be addressed in next update