- update to 3.3.0
  - BACKWARDS INCOMPATIBLE: Support for Python 3.5 has been removed
    due to low usage and maintenance burden.
  - BACKWARDS INCOMPATIBLE: The GCM and AESGCM now require 64-bit
    to 1024-bit (8 byte to 128 byte) initialization vectors. This
    change is to conform with an upcoming OpenSSL release that will
    no longer support sizes outside this window.
  - BACKWARDS INCOMPATIBLE: When deserializing asymmetric keys we
    now raise ValueError rather than UnsupportedAlgorithm when an
    unsupported cipher is used. This change is to conform with an
    upcoming OpenSSL release that will no longer distinguish
    between error types.
  - BACKWARDS INCOMPATIBLE: We no longer allow loading of finite
    field Diffie-Hellman parameters of less than 512 bits in
    length. This change is to conform with an upcoming OpenSSL
    release that no longer supports smaller sizes. These keys were
    already wildly insecure and should not have been used in any
    application outside of testing.
  - Updated Windows, macOS, and manylinux wheels to be compiled
    with OpenSSL 1.1.1i.
  - Python 2 support is deprecated in cryptography. This is the
    last release that will support Python 2.
  - Added the recover_data_from_signature() function to
    RSAPublicKey for recovering the signed data from an RSA
    signature. 
- Remove unnecessary dependency virtualenv.

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