Log Message:
py-cryptography[_vectors]: updated to 2.2

2.2:
BACKWARDS INCOMPATIBLE: Support for Python 2.6 has been dropped.
Resolved a bug in HKDF that incorrectly constrained output size.
Added :class:~cryptography.hazmat.primitives.asymmetric.ec.BrainpoolP256R1, \ 
:class:~cryptography.hazmat.primitives.asymmetric.ec.BrainpoolP384R1, and \ 
:class:~cryptography.hazmat.primitives.asymmetric.ec.BrainpoolP512R1 to support \ 
inter-operating with systems like German smart meters.
Added token rotation support to :doc:Fernet </fernet> with \ 
:meth:~cryptography.fernet.MultiFernet.rotate.
Fixed a memory leak in \ 
:func:~cryptography.hazmat.primitives.asymmetric.ec.derive_private_key.
Added support for AES key wrapping with padding via \ 
:func:~cryptography.hazmat.primitives.keywrap.aes_key_wrap_with_padding and \ 
:func:~cryptography.hazmat.primitives.keywrap.aes_key_unwrap_with_padding .
Allow loading DSA keys with 224 bit q.