Describe the bug
I just saw the issue #9, and it looks like Pydantic models are supported, however I couldn't manage adding a Pydantic model in documentation. I use pytkdocs through mkdocstrings so I didn't install pytkdocs myself, it is installed with mkdocstrings.
Am I doing something wrong?

To Reproduce
I referenced the model like this, (I also tried clearing the filters and enabled inherited_members to see if I can solve myself, but it didn't work anyway.) however only Pydantic's own methods shows up, nothing more.

relay/models.py

from pydantic import BaseModel

class TestModel(BaseModel):
    a : int
    """test"""

    b : str
    """test 2"""

    c : Optional[str] = None

reference2.md

::: relay.models.TestModel
    selection:
      inherited_members: true
      filters: []

Expected behavior
It should display attributes of a Pydantic model.

Screenshots

System (please complete the following information):

• pytkdocs version: 0.12.0 (installed automatically with mkdocstrings==0.16.0)
• Python version: 3.9.7 (x64)
• OS: Windows 10

Additional context

• pydantic version: 1.8.2

• docs/requirements.txt

  mkdocs==1.2.2
  mkdocs-material==7.3.0
  mkdocs-autorefs==0.3.0
  mkdocstrings==0.16.0
  mkdocs-static-i18n>=0.19
  

• mkdocs.yml (partial - only mkdocstrings part)

  plugins:
  - mkdocstrings:
    default_handler: python
    handlers:
      python:
        selection:
          inherited_members: true
          filters:
            - "!^_[^_]"
        rendering:
          show_root_heading: true
          heading_level: 1
          show_root_toc_entry: true
          show_root_full_path: false
          show_source: false
          show_bases: false
  

• I also have a custom CSS to hide keyword arguments:

   .doc.doc-heading > code.highlight.language-python > span:not(:first-child) {
       display: none !important;
   }

Edit: Looks like attributes only shows up as table when I add Attributes section to model's own docstring. But I expected to see all attributes without adding them to model's own docstring.