update changelog

html-aam/index.html

@@ -16314,6 +16314,7 @@ <h3>Change Log</h3>
         <section>
           <h4>Substantive changes since moving to the <a href="https://www.w3.org/WAI/ARIA/">Accessible Rich Internet Applications Working Group</a> (03-Nov-2019)</h4>
           <ul>
+            <li>06-June-2024: Add concept of Minimum Role. See <a href="https://github.com/w3c/html-aam/pull/454">GitHub PR 454</a>.</li>
             <li>09-Oct-2023: Acknowledge use of `hr` element within `select` element. See <a href="https://github.com/w3c/html-aam/pull/504">GitHub PR 504</a>.</li>
             <li>03-Oct-2023: Update image mappings to reference the primary synonym roles (`image` and `none`). See <a href="https://github.com/w3c/html-aam/pull/498">GitHub PR 498</a>.</li>
             <li>03-Oct-2023: Clarify when to expose required field as invalid. See <a href="https://github.com/w3c/html-aam/pull/429">GitHub PR 429</a>.</li>