Django-cbrf

* Added migrations and manage commands

* Fist PyPI release

* add Django 4.x support (zool1268)
* add GitHub action (tests)
* fix tests
* update Makefile (fancy output, venv paths)
* update cbrf package to version 0.5
* drop travis
* drop Django <= 2 support
* drop Python <= 3.7 support

* i hate travis

* deps update: cbrf
* tests fix

* Move denomination field to INTEGER type, instead SmallInteger (Issue 2)