- Update to 21.1.0:
- Python 3.4 is not supported anymore. It has been unsupported
by the Python core team for a while now, its PyPI downloads
are negligible, and our CI provider removed it as a supported
option.
- It's very unlikely that service-identity will break under 3.4
anytime soon, which is why we do not block its installation
on Python 3.4. But we don't test it anymore and will block it
once someone reports breakage.
- service_identity.exceptions.VerificationError can now be
pickled and is overall more well-behaved as an exception.
This raises the requirement of attrs to 19.1.0.
- This package actually truly requires six (it is expected to
work with Python 2.7 as well).