Log Message:
databases/py-peewee: Update to 3.2.4.

- Smarter handling of model-graph when dealing with compound queries
  (union, intersect, etc).
- If the same column-name is selected multiple times, first value
  wins.
- If ModelSelect.switch() is called without any arguments, default to
  the query's model.
- Fix issue where cloning a ModelSelect query did not result in the
  joins being cloned.