Update credits.md

credits.md

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 # Inspiration
-* SidDoyle's "Dark Doom". No code used.
+* "Dark Doom" by Josh771. No code used.
 
 # Code
 * Kinsie: Fancy Doom
 * Gutawer: Code template for per-sector iteration
 * FishyClockwork: Lighting adjustment code
 * phantombeta, Marisa Kirisame: Sector light effect removal suggestion and code
-* Lud: Iterator for extraneous actor removal
+* Accensus: Iterator for extraneous actor removal, addon support
 
 # Sounds
 * mshahen: "Flashlight On/Off Clicks" (freesound.org, 271109, modified) CC BY 3.0
@@ -15,4 +15,4 @@
 * Fort of Hard Knox, a1337spy, Orange Bomb: Multiplayer flashlight testing in Hideous Destructor
 
 # Graphics
-* Lud: Nice logo for DarkDoomZ
+* Accensus: Nice logo for DarkDoomZ