py-nacl: update to 1.3.0

1.3.0 2018-09-26
- Added support for Python 3.7.
- Update libsodium to 1.0.16.
- Run and test all code examples in PyNaCl docs through sphinx's doctest builder.
- Add low-level bindings for chacha20-poly1305 AEAD constructions.
- Add low-level bindings for the chacha20-poly1305 secretstream constructions.
- Add low-level bindings for ed25519ph pre-hashed signing construction.
- Add low-level bindings for constant-time increment and addition on fixed-precision big integers represented as little-endian byte sequences.
- Add low-level bindings for the ISO/IEC 7816-4 compatible padding API.
- Add low-level bindings for libsodium's crypto_kx... key exchange construction.
- Set hypothesis deadline to None in tests/test_pwhash.py to avoid incorrect test failures on slower processor architectures. GitHub issue #370

1.2.1 - 2017-12-04
- Update hypothesis minimum allowed version.
- Infrastructure: add proper configuration for readthedocs builder runtime environment.

1.2.0 - 2017-11-01
- Update libsodium to 1.0.15.
- Infrastructure: add jenkins support for automatic build of manylinux1 binary wheels
- Added support for SealedBox construction.
- Added support for argon2i and argon2id password hashing constructs and restructured high-level password hashing implementation to expose the same interface for all hashers.
- Added support for 128 bit siphashx24 variant of siphash24.
- Added support for from_seed APIs for X25519 keypair generation.
- Dropped support for Python 3.3.

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