I was updating the version of this package we're using on a project, and noticed that PyPI has a 0.7.0 release (https://pypi.org/project/wagtail-draftail-anchors/0.7.0/), however this GitHub repo is only showing 0.6.3 code.
I did double check the contents of the packages out of paranoia - but it looks like it's just something forgotten about during development.