I updated from V1.3.1 release2.
Besides the host keys in /etc/ssh was replaced. The /root/.ssh folder was deleted along with my authorized_keys file in it after updated to V1.4.2 release1 as well.
By the way, will the future update overwrite the file /etc/kvmd/nginx/ssl.conf? I have placed a pair of STL key and cert files in the folder /etc/kvmd/nginx with custom names and modified the file /etc/kvmd/nginx/ssl.conf accordingly.