Django-pgviews-redux

Support multiple databases 10 (thank you copelco!)

Python 3.10 support

Updated logging, logging exists messages to a separate logger so they can be individually ignored.

Drops support for Django 3.0, adds support for Django 3.2

New features:

- Support `WITH NO DATA` on materialized views
- Support indexes through `Meta.indexes` on materialized views
- Add a feature which tries to detect if a materialized view needs to be recreated on running `migrate` or `sync_pgviews`
- Add command `refresh_pgviews` which refreshes all materialized views