Update cryptography to 2.0.3

[pyup-bot]

There's a new version of cryptography available.
You are currently using 1.9. I have updated it to 2.0.3

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

Changelog

2.0.2

• Marked all symbols as hidden in the manylinux1 wheel to avoid a
  bug with symbol resolution in certain scenarios.

.. _v2-0-1:

2.0.1

• Fixed a compilation bug affecting OpenBSD.
• Altered the manylinux1 wheels to statically link OpenSSL instead of
  dynamically linking and bundling the shared object. This should resolve
  crashes seen when using uwsgi or other binaries that link against
  OpenSSL independently.
• Fixed the stack level for the signer and verifier warnings.

.. _v2-0:

2.0

• BACKWARDS INCOMPATIBLE: Support for Python 3.3 has been dropped.
• We now ship manylinux1 wheels linked against OpenSSL 1.1.0f. These wheels
  will be automatically used with most Linux distributions if you are running
  the latest pip.
• Deprecated the use of signer on
  :class:~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey,
  :class:~cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey,
  and
  :class:~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey
  in favor of sign.
• Deprecated the use of verifier on
  :class:~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKey,
  :class:~cryptography.hazmat.primitives.asymmetric.dsa.DSAPublicKey,
  and
  :class:~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicKey
  in favor of verify.
• Added support for parsing
  :class:~cryptography.x509.certificate_transparency.SignedCertificateTimestamp
  objects from X.509 certificate extensions.
• Added support for
  :class:~cryptography.hazmat.primitives.ciphers.aead.ChaCha20Poly1305.
• Added support for
  :class:~cryptography.hazmat.primitives.ciphers.aead.AESCCM.
• Added
  :class:~cryptography.hazmat.primitives.ciphers.aead.AESGCM, a "one shot"
  API for AES GCM encryption.
• Added support for :doc:/hazmat/primitives/asymmetric/x25519.
• Added support for serializing and deserializing Diffie-Hellman parameters
  with
  :func:~cryptography.hazmat.primitives.serialization.load_pem_parameters,
  :func:~cryptography.hazmat.primitives.serialization.load_der_parameters,
  and
  :meth:~cryptography.hazmat.primitives.asymmetric.dh.DHParameters.parameter_bytes
  .
• The extensions attribute on :class:~cryptography.x509.Certificate,
  :class:~cryptography.x509.CertificateSigningRequest,
  :class:~cryptography.x509.CertificateRevocationList, and
  :class:~cryptography.x509.RevokedCertificate now caches the computed
  Extensions object. There should be no performance change, just a
  performance improvement for programs accessing the extensions attribute
  multiple times.

.. _v1-9:

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

Happy merging! 🤖

[coveralls]

Coverage remained the same at 100.0% when pulling 707443d on pyup-update-cryptography-1.9-to-2.0.3 into e3ee1b9 on master.

[pyup-bot]

Closing this in favor of #42