update changelog

Author: scottaohara

index.html

@@ -64,6 +64,10 @@
         the following substantive additions and/or corrections have been proposed:
       </p>
       <ul>
+        <li>
+          <a href="https://github.com/w3c/html-aria/pull/525">23 December 2024 - Addition:</a>
+          Update the <a href="#el-img">`img`</a> element to allow the `math` role.
+        </li>
         <li>
           <a href="https://github.com/w3c/html-aria/pull/533">13 December 2024 - Addition:</a>
           Update to include the `image` role as preferred synonym to the `img` role.