message: docs: Added ngVikings 2020 on angular.io events
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diff: <td>Salt Lake City, Utah</td>
  <td>April 1-3, 2020</td>
  </tr>
  + <tr>
  + <th><a href="https://ngvikings.org/" title="ngVikings">ngVikings</a></th>
  + <td>Oslo, Norway</td>
  + <td>May 25-26 conference, 27 workshops, 2020</td>
  + </tr>
  </tbody>
  </table>
  