If you didn't port your app to libhandy 1, now is the best time. We even have a migration guide to help you! https://gnome.pages.gitlab.gnome.org/libhandy/hdy-migrating-0-0-to-1.html
If you ported to a libhandy 1 alpha, I also strongly recommend you to update to 0.90 as you are guaranteed you won't have to change a thing after.
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