qemu 4.0

Hi, I just updated my Proxmox server to 6.0 and I have to say that this update is just amazing. The version of QEmu got bumped up to 4.0 in this update, which finally brings support for DISCARD and WRITEZEROS to virtio-blk as per QEmu's changelogs (https://www.qemu.org/2019/04/24/qemu-4-0-0/)...