Django-db-connection-pool

Release Notes
* Make backend engines optional, Thank alexander-jacob for the PR.

For the complete changelog [look here](https://github.com/altairbow/django-db-connection-pool/compare/47bce29...e6fdcde).

Release Notes
* add PostgreSQL support, Thank kkxue for the PR
* translate comment to English

For the complete changelog [look here](https://github.com/altairbow/django-db-connection-pool/compare/ad53ca2...47bce29).

Release Notes
* update logging, to support l10n
* add dj_db_conn_pool.setup, for setting up default parameters

For the complete changelog [look here](https://github.com/altairbow/django-db-connection-pool/compare/e9dbb24...ad53ca2).