Log Message:
py-argon2-cffi: updated to 19.2.0

19.2.0:
Backward-incompatible changes:
- Python 3.4 is not supported anymore.
  It has been unsupported by the Python core team for a while now and its PyPI \ 
downloads are negligible.
  It's very unlikely that ``argon2-cffi`` will break under 3.4 anytime soon, but \ 
we don't test it and don't ship binary wheels for it anymore.

Changes:
- The dependency on ``enum34`` is now protected using a PEP 508 marker.
  This fixes problems when the sdist is handled by a different interpreter \ 
version than the one running it.