Update changelog, add self to credits.

Author: MageKing17

CHANGELOG.md

@@ -26,6 +26,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - `LERP` Lua binding has been deprecated, and renamed to `Lerp`.
 
+- Six activities (Harvester, Keepie-Uppie, Massacre, One-Man Army, One-Man Army (Diggers Only), and Survival) now avoid AI deployments on top of the player.
+
 </details>
 
 <details><summary><b>Fixed</b></summary>
@@ -54,6 +56,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - Fixed `MovableObject` INI and Lua property `IgnoreTerrain` not having any appreciable effect.
 
+- Fixed Signal Hunt speedrun mode not working properly if you used a player other than 1.
+
+- Fixed Decision Day camera potentially getting stuck at the start if player 1 wasn't present.
+
 </details>
 
 <details><summary><b>Removed</b></summary>

Resources/Credits.h

@@ -27,6 +27,7 @@ R I K U   " 4 Z K "   K
 S T E W I E
 T H O M A S   " C A U S E L E S S "   M A R C H
 T O P K E K
+W I L L I A M   " M A G E K I N G 1 7 "   H O W A R D
 Z A L O
 
 Art and Content Production