Django-cqrs

What's Changed
* Fixed serialization of DT / UUID instance_pk by maxipavlovic in https://github.com/cloudblue/django-cqrs/pull/100


**Full Changelog**: https://github.com/cloudblue/django-cqrs/compare/2.4.4...2.4.5

What's Changed
* Added info on support of proxied models to README by maxipavlovic in https://github.com/cloudblue/django-cqrs/pull/98
* Fixed common serialization of UUID field by maxipavlovic in https://github.com/cloudblue/django-cqrs/pull/99


**Full Changelog**: https://github.com/cloudblue/django-cqrs/compare/2.4.3...2.4.4

What's Changed
* `cqrs_sync` is more DB failure tolerant by maxipavlovic in https://github.com/cloudblue/django-cqrs/pull/97

**Full Changelog**: https://github.com/cloudblue/django-cqrs/compare/2.4.2...2.4.3

Fixed:
* Save message is skipped if object doesn't exist after transaction commit (RuntimeError is not raised) 95
* Termination is fixed in `cqrs_consume` 96

Fixed:
* AMQPConnectorException is caught now in RabbitMQ transport 91
* Integration tests execution and validation 94

- Drop support of **_python_** 3.6. Minimum supported version of **_python_** now - 3.7
- Bump minimum required version of **_ujson_** to 5.4.0 to fix CWE issues