Interface for the SSL_get_peer_finished, SSL_get_finished.
Added dependency for cryptography>=0.3.
Test split into multiple methods.
Added changelog entry.

If you use these methods to
implement TLS channel binding (RFC 5929) disable session
resumption because triple handshake attacks against TLS.
https://www.ietf.org/mail-archive/web/tls/current/msg11337.html
https://secure-resumption.com/tlsauth.pdf
merge master
Refactor the implementation to avoid duplication; use the result of the API to determine the proper buffer size to use.
Correct filename.
Docstring and whitespace fixes.
... avoid undefined behavior.
one more whitespace fix
Merge pull request #84 from exarkun/finished_messages

Introduce Connection.get_finished and Connection.get_peer_finished.