[PureOS] New PureOS images are ready for testing! (2020-07-18)

Hi! We have new images ready for testing for both PureOS 9 (Amber) and the Byzantium development version. For the former, please give feedback on the updated images on their tracking bug: https://tracker.pureos.net/T919 The Byzantium development images were also generated per-month as usual and can be found at https://downloads.pureos.net/byzantium/ for testing. Cheers, Matthias