fix: changelog for extension policy

Signed-off-by: Evan Prodromou <[email protected]>

Author: evanp

draft-extensions-policy.html

@@ -286,6 +286,16 @@ <h2>Previous Work</h2>
         to here in due course."
       </p>
     </section>
+    <section id='changelog'>
+      <ul>
+        <li>
+          <strong>2023-09-29</strong>: Add review criteria.
+        </li>
+        <li>
+          <strong>2023-06-24</strong>: First draft.
+        </li>
+      </ul>
+    </section>
     <section id='conformance'>
       <!-- This section is filled automatically by ReSpec. -->
     </section>