A lot of potential users will probably react similarly and think the project is not maintained anymore. Maybe you could clarify that by mentioning in the README that this project is basically done, but still maintained should a problem arise.
You must have been really confused when React moved to 16.X ;)
My scenario is similar. The current version is 100%. However, I'm going to be refactoring a bit, moving some pieces around, to support some new features. The only breaking changes that user's will notice is that ```darch recipes build``` will be moving to ```docker build .```. I've already converted my personal recipes to use it.