Log Message:
databases/py-peewee: Update to 3.0.10.

- Fix Database.drop_tables() signature to support cascade argument
- Fix querying documentation for custom functions
- Added len() method to ModelBase for convenient counting.
- Fix bug related to unsaved relation population (thanks @conqp)
- Fix count() on compound select
- Support coerce keyword argument with fn.XXX()
- Support updating existing model instance with dict_to_model-like API
- Fix equality tests with ArrayField