py-passlib: updated to 1.7.2

1.7.2:
This release rolls up assorted bug & compatibility fixes since 1.7.1.

New Features

* .. py:currentmodule:: passlib.hash
  :class:`argon2`: Now supports Argon2 "ID" and "D" hashes (assuming new enough backend library).
  Now defaults to "ID" hashes instead of "I" hashes, but this can be overridden via ``type`` keyword.

* .. py:currentmodule:: passlib.hash
  :class:`scrypt`: Now uses python 3.6 stdlib's :func:`hashlib.scrypt` as backend,
  if present

(adam)