Couldn't use with pydantic.BaseModel and enum.Enum

Hi! Hope you're doing good in pandemic.
I wanted to use your work in my project. But it seems to me that classmaker/classbuilder doesn't work like:  

```python
import enum
import pydantic
from classmaker import classbuilder 


class MyModel(pydantic.BaseModel)
     a: int
     b: str


@classbuilder(MyModel, Enum)
class MyEnum:
     FIRST_VALUE = MyModel(a=1, b="2")
```