Cant set sphinx style in flake8 config

[jonyscathe]

I believe that this line should allow "sphinx"?

https://github.com/jsh9/pydoclint/blob/main/pydoclint/flake8_entry.py#L144

[jsh9]

Thanks for submitting this issue! Unit tests didn't catch it. I believe only integration tests will catch this kind of issue. I may consider adding integration tests in the future.

[jonyscathe]

Thanks for the quick fix