message: removed coverity badge because it just doesn't fit :|
diff: <td>
  <a href="https://coveralls.io/github/onqtam/doctest?branch=master"><img src="https://coveralls.io/repos/github/onqtam/doctest/badge.svg?branch=master"></a>
  </td>
  + <!--
  <td>
  <a href="https://scan.coverity.com/projects/onqtam-doctest"><img src="https://scan.coverity.com/projects/7865/badge.svg"></a>
  </td>
  + -->
  </tr>
  <tr>
  <td>
  <td>
  <a href="https://coveralls.io/github/onqtam/doctest?branch=dev"><img src="https://coveralls.io/repos/github/onqtam/doctest/badge.svg?branch=dev"></a>
  </td>
  + <!--
  <td>
  </td>
  + -->
  </tr>
  </table>
  </b>
  