Bump pynacl from 1.2.1 to 1.3.0

[dependabot-preview]

Bumps pynacl from 1.2.1 to 1.3.0.

Changelog

Sourced from pynacl's changelog.

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

Commits

• 4881c87 release 1.3.0 (#475)
• e0a0f34 Replace use of six.binary_type with bytes (#471)
• a232ab0 Drop EOL Python 2.6 & 3.3 from tox.ini (#470)
• ba3aed9 HTTPS a URL (#472)
• c741957 remove PURGE command (#464)
• 8e3d93f Update pypi.python.org URL to pypi.org (#463)
• 2ed2dea expose crypto_secretstream_xchacha20poly1305 bindings (#460)
• 4409992 docs: fix typo (#458)
• 8ee3f21 Added a pyproject.toml (#457)
• d5c0be9 stop codecov from commenting on PRs (#455)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #58.