Update version badge from v5.1.0.0 to v5.3.1.5

Author: Izumi-Sonoka

download.html

@@ -312,7 +312,7 @@ <h2>RELEASES</h2>
           <td>any</td>
           <td>~300KB</td>
           <td style="color:var(--text-mute)">see GitHub</td>
-          <td><span class="badge badge-alpha">v5.1.0.0</span></td>
+          <td><span class="badge badge-alpha">v5.3.1.5</span></td>
         </tr>
       </tbody>
     </table>