17.3.0
fix #664 (#665)
Delete rand.py (#675)
Don't zero memory when we don't have to. (#578)
Avoid a double call to X509_STORE_CTX_init as it leaks memory (#691)
Add an informative __main__.py (#620)
Fixes #655 -- deprecate OpenSSL.tsafe (#673)
bump version and update changelog (#693)