Planetmint-cryptoconditions

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* changed the type of license to AGPLv3

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* added zenroom support
* fixed various warnings

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Changed
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* Maintenance release. Updating package dependencies.

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Changed
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* ``crypto.ed25519_generate_key_pair()`` now supports an optional keyword argument ``seed`` to support deterministic generation
of a keypair from a seed.
Example use: ``crypto.ed25519_generate_key_pair(seed=seed_value)``
Note that the value of ``seed`` must be a 32-byte bytes object.
Thanks to external contributor excerebrose for adding this functionality in pull request 487.
* Changed setup.py to use ``PyNaCl~=1.1.0`` again, because 1.2.1 was breaking software that uses the cryptoconditions package.

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Changed
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* Update setup.py to use ``PyNaCl~=1.2.1``

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Changed
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* Use `sign` and `verify` instead of deprecated `signer` and `verifier`
for one-shot sign/verify operation using cryptography.