The upgrade 0.9.1 from 0.9.2 is a breaking change. The changelog states this:
After upgrade to this release, projects with previous migration files generated by 'aerich<=0.9.1', must run the following command to fill 'MODELS_STATE' into the migration files.
Nevertheless, this is a minor version update. A breaking change should update the major version.
See UpstreamDataInc/goosebit#393 how such things breaks software that uses this library.