message: docs: add ReactiveConf 2019 to events
  PR Close
diff: <td>Berlin, Germany</td>
  <td>August 29th workshops, 30-31 conference, 2019</td>
  </tr>
  + <!-- ReactiveConf 2019 -->
  + <tr>
  + <th><a href="https://reactiveconf.com/" title="ReactiveConf">ReactiveConf</a></th>
  + <td>Prague, Czech Republic</td>
  + <td>October 30 - November 1, 2019</td>
  + </tr>
  </tbody>
  </table>
  