SDL_mixer: updated patch notes for SDL3_mixer.

SDL Commits
1 
From 767fedc3b8c8953245a79f754dca05a387f6ce89 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 12 Mar 2025 18:55:10 +0300
Subject: [PATCH] updated patch notes for SDL3_mixer.

---
 CHANGES.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGES.txt b/CHANGES.txt
index 9df178b17..4c81ab14d 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,2 +1,4 @@
 3.0.0:
+ * Removed support for libmodplug as a MOD music backend.
+ * Go back to using dr_mp3 as the default backend for MP3 music
  * Updated for SDL 3.0