PyCA cryptography 2.6.1 released

[Paul Kehrer]

PyCA cryptography 2.6.1 has been released to PyPI. cryptography includes
both high level recipes and low level interfaces to common cryptographic
algorithms such as symmetric ciphers, asymmetric algorithms, message
digests, X509, key derivation functions, and much more. We support Python
2.7, Python 3.4+, and PyPy.

Changelog (https://cryptography.io/en/latest/changelog/#v2-6-1):

* Resolved an error in our build infrastructure that broke our Python3
wheels for macOS and Linux.

-Paul Kehrer (reaperhulk)