I don't see a change log per se, but this might do: https://git.ispconfig.org/ispconfig/ispconfig3/milestones/47 But a lot of things get done without a specific issue opened, so to get really detailed: https://git.ispconfig.org/ispconfig/ispconfig3/activity
If you mean the p9 release, then the milestone is 50: https://git.ispconfig.org/ispconfig/ispconfig3/milestones/50 The completes issues are in the right column. This link can also be found in the release notes of the release at ispconfig.org and here in the release forum. But as Jesse pointed out for the next major version 3.1, not every change in 3.1 has an issue, so the activity log is a good place to see what's going on.
