* Enable the Facts application, go to the Reports of a Project with task changes over time, look at charts, hover over data points, read the tooltip - e.g. on http://phorge.localhost/project/reports/1/ or http://phorge.localhost/maniphest/report/burn/
* Check HTML source of above URIs for the `<script type="text/javascript">` loading `d3.min.js` and open the JS file to verify the d3 version number bump.
* Check Console of web browser's developer tools for no errors.