Document Unix timestamp support

Author: nielsdos

reference/phar/Phar.xml

@@ -154,8 +154,30 @@
 <!-- }}} -->
 
   </section>
+
+  <section role="changelog">
+   &reftitle.changelog;
+   <informaltable>
+    <tgroup cols="2">
+     <thead>
+      <row>
+       <entry>&Version;</entry>
+       <entry>&Description;</entry>
+      </row>
+     </thead>
+     <tbody>
+      <row>
+       <entry>8.4.0</entry>
+       <entry>
+        Added support for the Unix timestamp extension for Zip-based archives.
+       </entry>
+      </row>
+     </tbody>
+    </tgroup>
+   </informaltable>
+  </section>
  </partintro>
- 
+
  &reference.phar.entities.Phar;
 
 </reference>