This release separates itself from the v0.2.X releases. Ansible's API changed too much to support backwards compatibility so from now on, v0.2.X releases will be for Ansible < 2.10 and v0.3.X will be for Ansible 2.10+.
`See here for details <https://github.com/dw/mitogen pull/715#issuecomment-750697248>`_.