21.0.0
Add SSL_CTX_set_min_proto_version/SSL_CTX_set_max_proto_version bindings (#985)
Drop no longer needed old stuff
Fixed a handful of typos (#755)
Bootstrapping Sphinx documentation
Use RTD theme
Fixed #631 -- deprecate all of OpenSSL.rand (#658)
Switch to a nicer changelog format
Tox.ini; Test on Python 3.9 and make flake8 stricter (#966)
fixes #934 -- kill dead link (#936)
Update contributing & policy information
cffi callbacks are easy