Marshmallow

+++++++++++++++++++

Bug fixes:

- Prevent warning about importing from ``collections`` on Python 3.7
(:pr:`1354`). Thanks :user:`nicktimko` for the PR.

+++++++++++++++++++

Bug fixes:

- Fix bug that raised ``TypeError`` when invalid data type is
passed to a nested schema with ``validates`` (:issue:`1342`).

+++++++++++++++++++

Bug fixes:

- Fix deprecated functions' compatibility with Python 2 (:issue:`1337`).
Thanks :user:`airstandley` for the catch and patch.
- Fix error message consistency for invalid input types on nested fields (:issue:`1303`).
This is a backport of the fix in :pr:`857`. Thanks :user:`cristi23` for the
thorough bug report and the PR.

Deprecation/Removal:

- Python 2.6 is no longer officially supported (:issue:`1274`).

+++++++++++++++++++

Bug fixes:

- Fix deserializing ISO8601-formatted datetimes with less than 6-digit
miroseconds (:issue:`1251`). Thanks :user:`diego-plan9` for reporting.

+++++++++++++++++++

Bug fixes:

- Microseconds no longer gets lost when deserializing datetimes without dateutil
installed (:issue:`1147`).

+++++++++++++++++++

Bug fixes:

- Fix bug where nested fields in ``Meta.exclude`` would not work on
multiple instantiations (:issue:`1212`). Thanks :user:`MHannila` for
reporting.