This fork was originally used to provide UPM support to NaughtyAttributes. The official NaughtyAttributes repo now has UPM support, so this fork is now obsolete.
I won't be deleting this repo because people are using it in their projects and I don't want to break those. However, this fork will not be updated anymore. You should switch to the official repo.
Caveat: I'll be using non-master branches to make pull requests to the official repo. The master branch is frozen however.