Update peewee to 3.14.8

[pyup-bot]

This PR updates peewee from 3.14.7 to 3.14.8.

Changelog

3.14.8

Back-out all changes to automatically use RETURNING for `SqliteExtDatabase`,
`CSqliteExtDatabase` and `APSWDatabase`. The issue I found is that when a
RETURNING cursor is not fully-consumed, any parent SAVEPOINT (and possibly
transaction) would not be able to be released. Since this is a
backwards-incompatible change, I am going to back it out for now.

Returning clause can still be specified for Sqlite, however it just needs to be
done so manually rather than having it applied automatically.

[View commits](https://github.com/coleifer/peewee/compare/3.14.7...3.14.8)

Links

• PyPI: https://pypi.org/project/peewee
• Changelog: https://pyup.io/changelogs/peewee/
• Repo: https://github.com/coleifer/peewee/

[coveralls]

Coverage decreased (-0.6%) to 84.241% when pulling ef8a6f6 on pyup-update-peewee-3.14.7-to-3.14.8 into 6238305 on master.