message: docs: order upcoming events in chronological order
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diff: </tr>
  </thead>
  <tbody>
  - <!-- AngularConnect 2019-->
  + <!-- ng-conf 2019-->
  <tr>
  - <th><a href="https://www.angularconnect.com/?utm_source=angular.io&utm_medium=referral" title="AngularConnect">AngularConnect</a></th>
  - <td>London, UK</td>
  - <td>September 19-20, 2019</td>
  + <th><a href="https://ng-conf.org/" title="ng-conf">ng-conf</a></th>
  + <td>Salt Lake City, Utah</td>
  + <td>May 1-3, 2019</td>
  </tr>
  <!-- ngVikings 2019-->
  <tr>
  <td>Copenhagen, Denmark</td>
  <td>May 26 (workshops), 27-28 (conference), 2019</td>
  </tr>
  - <!-- ng-conf 2019-->
  + <!-- AngularConnect 2019-->
  <tr>
  - <th><a href="https://ng-conf.org/" title="ng-conf">ng-conf</a></th>
  - <td>Salt Lake City, Utah</td>
  - <td>May 1-3, 2019</td>
  + <th><a href="https://www.angularconnect.com/?utm_source=angular.io&utm_medium=referral" title="AngularConnect">AngularConnect</a></th>
  + <td>London, UK</td>
  + <td>September 19-20, 2019</td>
  </tr>
  </tbody>
  </table>
  