Remove support for SSLv3, make SSLv23 the default #5
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SSLv3 is broken: https://en.wikipedia.org/wiki/POODLE
PROTOCOL_SSLv23 is recommended for maximum compatibility with all
versions of SSL/TLS.
Python's inbuilt ssl library has itself switched to SSLv3 in future
versions.
https://bugs.python.org/issue20896
https://hg.python.org/cpython/rev/55f62fa5bebc
Debian has removed the PROTOCOL_SSLv3 constant from its patched version
of Python standard libraries.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768611
Other libraries adopting similar appoach:
https://github.com/gevent/gevent/pull/517/files