There were 44 commits between the release-1.4 and release-1.6 tags, with lots more info in the git changelog.
Hopefully this will be the last Artifastring release before Vivi 1.0 (within the next week). After that, expect not much in July. August will hopefully see Artifastring being expanded to cover cello, viola, and maybe even multiple violins. This relies on a Masters project at the University of Glasgow, so it's not under my control.