os.EX_OK not available on Windows

[KyleKing]

FYI: os.EX_OK isn't available on Windows and fails when running flake8 --print-dlint-linters

Not sure what the appropriate substitute is, but I'd be happy to test any changes

dlint/dlint/extension.py

Line 46 in 828a156

sys.exit(os.EX_OK)

[mschwager]

Thanks for opening this! I'll take a look and make sure we run this flag in AppVeyor so we catch issues like this in the future.

[SamuelMarks]

FYI - I added Windows support ~3 years ago - https://bugs.python.org/issue44321