http://l3tczdiiwoo63iwxty4lhs6p7eaxop5micbn7vbliydgv63x5zrrrfyd.onion/developer-manual/newrelease.html
Y, the version minor, is increased for every release except for pure bug fix releases in which case only
Z, the point or sub version, is increased. The point version is reset to zero when the minor changes. 6.2. Before the Release The following must be done by one of the developers prior to each new release.