Questionnaire 5.0.2 supporting Moodle 5.0, 5.1 and 5.2 has been released. Details are in the "CHANGES" file. The release can be found on Github and the Moodle plugins database.
This will be the last release using this codebase. Future releases will utilize the new codebase currently in development.
If you can support this project, please consider it.