PyCA cryptography 2.0.3 released

[Paul Kehrer]

PyCA cryptography 2.0.3 has been released to PyPI. cryptography includes
both high level recipes and low level interfaces
to common cryptographic algorithms such as symmetric ciphers, message
digests, and key derivation functions. We support Python 2.6-2.7, Python
3.4+, and PyPy.

This release fixes an issue with weak linking symbols when compiling on
macOS versions older than 10.12. There are no other changes.

-Paul Kehrer (reaperhulk)