Update cryptography to 1.9

[pyup-bot]

There's a new version of cryptography available.
You are currently using 1.6. I have updated it to 1.9

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.9

• BACKWARDS INCOMPATIBLE: Elliptic Curve signature verification no longer
  returns True on success. This brings it in line with the interface's
  documentation, and our intent. The correct way to use
  :meth:~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.verify
  has always been to check whether or not
  :class:~cryptography.exceptions.InvalidSignature was raised.
• BACKWARDS INCOMPATIBLE: Dropped support for macOS 10.7 and 10.8.
• BACKWARDS INCOMPATIBLE: The minimum supported PyPy version is now 5.3.
• Python 3.3 support has been deprecated, and will be removed in the next
  cryptography release.
• Add support for providing tag during
  :class:~cryptography.hazmat.primitives.ciphers.modes.GCM finalization via
  :meth:~cryptography.hazmat.primitives.ciphers.AEADDecryptionContext.finalize_with_tag.
• Fixed an issue preventing cryptography from compiling against
  LibreSSL 2.5.x.
• Added
  :meth:~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey.key_size
  and
  :meth:~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey.key_size
  as convenience methods for determining the bit size of a secret scalar for
  the curve.
• Accessing an unrecognized extension marked critical on an X.509 object will
  no longer raise an UnsupportedExtension exception, instead an
  :class:~cryptography.x509.UnrecognizedExtension object will be returned.
  This behavior was based on a poor reading of the RFC, unknown critical
  extensions only need to be rejected on certificate verification.
• The CommonCrypto backend has been removed.
• MultiBackend has been removed.
• Whirlpool and RIPEMD160 have been deprecated.

1.8.2

• Fixed a compilation bug affecting OpenSSL 1.1.0f.
• Updated Windows and macOS wheels to be compiled against OpenSSL 1.1.0f.

1.8.1

• Fixed macOS wheels to properly link against 1.1.0 rather than 1.0.2.

1.8

• Added support for Python 3.6.
• Windows and macOS wheels now link against OpenSSL 1.1.0.
• macOS wheels are no longer universal. This change significantly shrinks the
  size of the wheels. Users on macOS 32-bit Python (if there are any) should
  migrate to 64-bit or build their own packages.
• Changed ASN.1 dependency from pyasn1 to asn1crypto resulting in a
  general performance increase when encoding/decoding ASN.1 structures. Also,
  the pyasn1_modules test dependency is no longer required.
• Added support for
  :meth:~cryptography.hazmat.primitives.ciphers.CipherContext.update_into on
  :class:~cryptography.hazmat.primitives.ciphers.CipherContext.
• Added
  :meth:~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKeyWithSerialization.private_bytes
  to
  :class:~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKeyWithSerialization.
• Added
  :meth:~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKeyWithSerialization.public_bytes
  to
  :class:~cryptography.hazmat.primitives.asymmetric.dh.DHPublicKeyWithSerialization.
• :func:~cryptography.hazmat.primitives.serialization.load_pem_private_key
  and
  :func:~cryptography.hazmat.primitives.serialization.load_der_private_key
  now require that password must be bytes if provided. Previously this
  was documented but not enforced.
• Added support for subgroup order in :doc:/hazmat/primitives/asymmetric/dh.

1.7.2

• Updated Windows and macOS wheels to be compiled against OpenSSL 1.0.2k.

1.7.1

• Fixed a regression in int_from_bytes where it failed to accept
  bytearray.

1.7

• Support for OpenSSL 1.0.0 has been removed. Users on older version of OpenSSL
  will need to upgrade.
• Added support for Diffie-Hellman key exchange using
  :meth:~cryptography.hazmat.primitives.asymmetric.dh.DHPrivateKey.exchange.
• The OS random engine for OpenSSL has been rewritten to improve compatibility
  with embedded Python and other edge cases. More information about this change
  can be found in the
  pull request <https://github.com/pyca/cryptography/pull/3229>_.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[pyup-bot]

Closing this in favor of #34