Dataframe_image v0.2.22 cannot save to BytesIO buffer, but v0.1.11 can.

[rahulraj80]

Minimal code to reproduce the error:

v0.2.22 :

import pandas as pd
from io import BytesIO
import dataframe_image as dfi
df = pd.DataFrame({'num_legs': [2, 4, 8, 0],
                    'num_wings': [2, 0, 0, 0],
                    'num_specimen_seen': [10, 2, 1, 8]},
                   index=['falcon', 'dog', 'spider', 'fish'])
buf = BytesIO()
df.dfi.export(buf, table_conversion='matplotlib')

Error :

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
[<ipython-input-2-fa5a6a1b0f2e>](https://localhost:8080/#) in <cell line: 9>()
      7                    index=['falcon', 'dog', 'spider', 'fish'])
      8 buf = BytesIO()
----> 9 df.dfi.export(buf, table_conversion='matplotlib')

4 frames
[/usr/local/lib/python3.10/dist-packages/dataframe_image/_pandas_accessor.py](https://localhost:8080/#) in export(self, filename, fontsize, max_rows, max_cols, table_conversion, chrome_path, dpi)
     33         dpi=None,
     34     ):
---> 35         return export(
     36             self._df,
     37             filename,

[/usr/local/lib/python3.10/dist-packages/dataframe_image/_pandas_accessor.py](https://localhost:8080/#) in export(obj, filename, fontsize, max_rows, max_cols, table_conversion, chrome_path, dpi, use_mathjax)
     83 
     84         # get extension from filename without dot
---> 85         extension = Path(filename).suffix
     86         if extension.startswith("."):
     87             extension = extension[1:]

[/usr/lib/python3.10/pathlib.py](https://localhost:8080/#) in __new__(cls, *args, **kwargs)
    958         if cls is Path:
    959             cls = WindowsPath if os.name == 'nt' else PosixPath
--> 960         self = cls._from_parts(args)
    961         if not self._flavour.is_supported:
    962             raise NotImplementedError("cannot instantiate %r on your system"

[/usr/lib/python3.10/pathlib.py](https://localhost:8080/#) in _from_parts(cls, args)
    592         # right flavour.
    593         self = object.__new__(cls)
--> 594         drv, root, parts = self._parse_args(args)
    595         self._drv = drv
    596         self._root = root

[/usr/lib/python3.10/pathlib.py](https://localhost:8080/#) in _parse_args(cls, args)
    576                 parts += a._parts
    577             else:
--> 578                 a = os.fspath(a)
    579                 if isinstance(a, str):
    580                     # Force-cast str subclasses to str (issue #21127)

TypeError: expected str, bytes or os.PathLike object, not BytesIO

No errors on v0.1.11

Google Colab notebook for the test