Django-api-forms

- **Changed**: All package exceptions inherits from `ApiFormException`.
- **Fixed**: Specifying encoding while opening files in `setup.py` (failing on Windows OS).

- **Changed**: Moved field error messages to default_error_messages for easier overriding and testing.
- **Fixed**: Fix KeyError when invalid values are sent to FieldList.
- **Fixed**: Removed unnecessary error checking in FieldList.

- **Added**: Tests for fields
- **Changed**: Remove DeclarativeFieldsMetaclass and import from Django instead.
- **Changed**: Msgpack dependency is no longer required.
- **Changed**: Empty values passed into a FormField now return {} rather than None.
- **Fixed**: Throw a more user friendly error when passing non-Enums or invalid values to EnumField.

- **Changed** Use [poetry](https://python-poetry.org/) instead of [pipenv](https://github.com/pypa/pipenv)
- **Changed**: Library renamed from `django_api_forms` to `django-api-forms` (cosmetic change without effect)

- **Changed**: Library renamed from `django_request_formatter` to `django_api_forms`
- **Changed**: Imports in main module `django_api_forms`

- **Added**: `BooleanField` introduced