Last week was a bit more focused on the infrastructure than the code. Most of our servers have been upgraded to Debian Stretch and can (finally) benefit from PHP 7.
The upgrade also brought more up to date versions to the demo server, it's now running MariaDB 10.1.21 and MySQL 8.0.0. The latter one will probably show some bugs in our code base, as it has not yet been fully tested.
Code wise, the most visible change is to bundle Let's encrypt root SSL certificate with our code, so that we can verify the server even if the host SSL verification is broken (what seems to happen on some Windows based setups).