I'm a very happy user of GitPunch. In my own projects I use a release tag naming convention release/$version. In the email received today I noted that a link is broken. It seems that the release/ part was skipped. The link in the email I've got was:
https://github.com/szpak/mockito-java8/releases/tag/2.4.0

instead of:
https://github.com/szpak/mockito-java8/releases/tag/release%2F2.4.0

As the release process (including tagging) is done automatically (there are no manual changes in tags), the easiest explanation is that GitPunch removes the release/ as a part of the Git path (to the latest occurrence of /).