fix: fix astroid version

[TeaDove]

Astroid 3.0.0 brokes flake8-warning with error:

Traceback (most recent call last):
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/runpy.py", line 188, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/runpy.py", line 147, in _get_module_details
    return _get_module_details(pkg_main_name, error)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/runpy.py", line 111, in _get_module_details
    __import__(pkg_name)
  File "/private/tmp/flake8-warnings/flake8_warnings/__init__.py", line 4, in <module>
    from ._flake8_plugin import Flake8Checker
  File "/private/tmp/flake8-warnings/flake8_warnings/_flake8_plugin.py", line 6, in <module>
    from ._finder import WarningFinder
  File "/private/tmp/flake8-warnings/flake8_warnings/_finder.py", line 10, in <module>
    from ._extractors import EXTRACTORS, Extractor, WarningInfo
  File "/private/tmp/flake8-warnings/flake8_warnings/_extractors/__init__.py", line 7, in <module>
    from ._warnings import WarningsExtractor
  File "/private/tmp/flake8-warnings/flake8_warnings/_extractors/_warnings.py", line 11, in <module>
    astroid.TryExcept,
AttributeError: module 'astroid' has no attribute 'TryExcept'

Binding 2.x version solves issue

[orsinium]

Thank you for your contribution! Can we upgrade instead? Was TryExcept renamed?

[orsinium]

The issue is resolved in #4 by @aliaksei-protchanka. I still appreciate your contribution. Thank you for bringing attention to the issue ❤️

[TeaDove]

@orsinium it's much better. Ty!