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change default intermediate hash from SHA-1 to SHA-512 #80
Note that HMAC is still secure even with MD5. This is mostly a change for aesthetics so people will stop asking, although it doesn't hurt to be preemtive in this case.
Skipping SHA-256 for SHA-512 since it's more efficient on 64-bit.
See https://mail.python.org/pipermail/cryptography-dev/2017-March/000737.html for discussion.