Included typing-extensions to list of requirements

[googlygoo]

With the upgrade to version 3.0, an new package requirement was added but not included in the form of typing_extensions. fixes: #161

Example of current error

Python 3.9.13 (main, Jul  7 2022, 09:29:37)
[Clang 13.1.6 (clang-1316.0.21.2.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from swagger_spec_validator.common import SwaggerValidationError
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "~/.venv/lib/python3.9/site-packages/swagger_spec_validator/__init__.py", line 1, in <module>
    from swagger_spec_validator.common import SwaggerValidationError
  File "~/.venv/lib/python3.9/site-packages/swagger_spec_validator/common.py", line 18, in <module>
    from typing_extensions import ParamSpec
ModuleNotFoundError: No module named 'typing_extensions'

Are there other solutions Yes, you could remove the reference to ParamSpec and typehint the section of code as follows

def wrap_exception(method: Callable[..., T]) -> Callable[..., T]:
    @functools.wraps(method)
    def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
        try:
            return method(*args, **kwargs)
        except Exception as e:
            raise SwaggerValidationError(str(e), e).with_traceback(sys.exc_info()[2])

    return wrapper

[terencehonles]

@kaisen it looks like you might be able to review this as this is related to https://github.com/Yelp/swagger_spec_validator/pull/157

[kaisen]

Thanks for catching and fixing this!