1.4.0 -- 2019-05-23

Minor

• Remove dependence on all source_stream APIs except for read(). #103

Potentially Backwards Incompatible

• Encryption streams no longer close the source_stream when they themselves close.
  If you are using context managers for all of your stream handling,
  this change will not affect you.
  However, if you have been relying on the StreamDecryptor
  or StreamEncryptor to close your source_stream for you,
  you will now need to close those streams yourself.
• StreamDecryptor.body_start and StreamDecryptor.body_end,
  deprecated in a prior release,
  have now been removed.

Maintenance

• Move all remaining unittest tests to pytest. #99

Bugfixes

• Fix MasterKeyprovider.decrypt_data_key_from_list error handling. #150