Read somewhere else (no ill intent towards the OP): "I've upgraded from 0.9 to 0.10 and everything broke! Hey devs, if you do breaking changes, this should be 1.0, that's how SemVer works!"
Actually, that's not how SemVer works. In 0.x, anything goes.
Just wanted to PSA this, as I assume it's a common misconception.