PyCA cryptography 1.2.1 released

[Paul Kehrer]

If one birthday release is good, two is surely better? To test that theory PyCA cryptography 1.2.1 has been released. This version, in addition to all the changes outlined in the 1.2 release, contains a fix for an issue that caused pyOpenSSL to raise an exception in many situations (https://cryptography.io/en/latest/changelog/).

-Paul Kehrer (reaperhulk)