move to python-cryptography v1.5
version 1.5 (released nearly 3 years ago, on 2016-08-26) introduced sign() and verify() for all asymmetric algorithms. Without this change, with modern versions of python-cryptography, we see warnings like: /usr/lib/python3/dist-packages/pgpy/packet/fields.py:1177: CryptographyDeprecationWarning: signer and verifier have been deprecated. Please use sign and verify instead. The version of python-cryptography in debian stretch (oldstable) is 1.7.1, for point of reference.
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