Peewee

* Add support for passing `cascade=True` when dropping tables. Fixes 1449.
* Fix issues with backrefs and inherited foreign-keys. Fixes 1448.

[View commits](https://github.com/coleifer/peewee/compare/3.0.7...3.0.8)

* Add `select_extend()` method to extend existing SELECT-ion. [Doc](http://docs.peewee-orm.com/en/latest/peewee/api.html#Select.select_extend).
* Accept `set()` as iterable value type, fixes 1445
* Add test for model/field inheritance and fix bug relating to recursion error
when inheriting foreign-key field. Fixes 1448.
* Fix regression where consecutive calls to `ModelSelect.select()` with no
parameters resulted in an empty selection. Fixes 1438.

[View commits](https://github.com/coleifer/peewee/compare/3.0.6...3.0.7)

Add constraints for ON UPDATE/ON DELETE to foreign-key constraint - 1443.

[View commits](https://github.com/coleifer/peewee/compare/3.0.5...3.0.6)

Adds Model.index(), a short-hand method for declaring ModelIndex instances.

* [Model.index docs](http://docs.peewee-orm.com/en/latest/peewee/api.html#Model.index)
* [Model.add_index docs](http://docs.peewee-orm.com/en/latest/peewee/api.html#Model.add_index)
* [ModelIndex docs](http://docs.peewee-orm.com/en/latest/peewee/api.html#ModelIndex)

[View commits](https://github.com/coleifer/peewee/compare/3.0.4...3.0.5)

Re-add a shim for `PrimaryKeyField` (renamed to `AutoField`) and log a
deprecation warning if you try to use it.

[View commits](https://github.com/coleifer/peewee/compare/3.0.3...3.0.4)

Includes fix for bug where column-name to field-name translation was not being
done when running select queries on models whose field name differed from the
underlying column name (1437).

[View commits](https://github.com/coleifer/peewee/compare/3.0.2...3.0.3)