Add option warnings-as-errors to lint & analyze #3371
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Implementes #3312.
I tested that this works manually by building via
swift build -c release
and running.build/release/swiftlint --warnings-as-errors
and it worked just as expected. Without that option, I had 1 warning & 1 error reported, with that options 2 errors were reported, so I can confirm it works. But I did not add any unit tests because there seem to be no unit tests for the CLI product, other options like--lenient
seem also not to be unit tested.Note that I did not mess with any tresholds (like
lenient
does), I think we could think about those things after seeing how people are using this new option, so I'd rather keep this simple for now.