Django 1.10 support: AttributeError: module 'django.db.models' has no attribute 'SubfieldBase'

[m-aciek]

Package is currently not compatibile with Django 1.10:

    Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7fb1f340a598>
    Traceback (most recent call last):
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/utils/autoreload.py", line 226, in wrapper
        fn(*args, **kwargs)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 113, in inner_run
        autoreload.raise_last_exception()
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/utils/autoreload.py", line 249, in raise_last_exception
        six.reraise(*_exception)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/utils/six.py", line 685, in reraise
        raise value.with_traceback(tb)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/utils/autoreload.py", line 226, in wrapper
        fn(*args, **kwargs)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/__init__.py", line 27, in setup
        apps.populate(settings.INSTALLED_APPS)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/apps/registry.py", line 108, in populate
        app_config.import_models(all_models)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/django/apps/config.py", line 199, in import_models
        self.models_module = import_module(models_module_name)
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/importlib/__init__.py", line 126, in import_module
        return _bootstrap._gcd_import(name[level:], package, level)
      File "<frozen importlib._bootstrap>", line 986, in _gcd_import
      File "<frozen importlib._bootstrap>", line 969, in _find_and_load
      File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
      File "<frozen importlib._bootstrap_external>", line 662, in exec_module
      File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/dynamic_forms/models.py", line 18, in <module>
        from dynamic_forms.fields import TextMultiSelectField
      File "/home/maciek/.virtualenvs/ankiety/lib/python3.5/site-packages/dynamic_forms/fields.py", line 13, in <module>
        class TextMultiSelectField(six.with_metaclass(models.SubfieldBase,
    AttributeError: module 'django.db.models' has no attribute 'SubfieldBase'

[MarkusH]

Fixed in v0.5.2