Update bin/dwhich.dart?

Hey there @bsutton -- getting into all of this.

Could you confirm that dwhich.dart needs to be updated?

It seems to be still using an old Args class from an earlier version of DCLI (3.x.x?)

It also seems that the new ExitException in DCLI 4.x found here:
https://github.com/onepub-dev/dcli/blob/master/dcli_sdk/lib/src/util/exit.dart
or here:
https://github.com/onepub-dev/dcli/blob/master/dcli_sdk/lib/src/util/exceptions.dart

And perhaps a related class here:
https://github.com/onepub-dev/dcli/blob/master/dcli_core/lib/src/util/dcli_exception.dart
and here:
https://github.com/onepub-dev/dcli/blob/master/dcli_core/lib/src/util/run_exception.dart

Let me know if this is relevant/related, happy to get this updated with a bit of direction!

Cheers,
-Tsavo

bin/dwhich.dart から始め、issue にリンクされている DCLI 4.x のファイル（dcli_sdk/lib/src/util/exit.dart、dcli_sdk/lib/src/util/exceptions.dart、dcli_core/lib/src/util/dcli_exception.dart、dcli_core/lib/src/util/run_exception.dart）と Args および例外の使用方法を比較してください。どの API が古くなっているかを確認し、関連する DCLI 4.x インターフェースに合わせて dwhich.dart が更新されていることを完了条件としてください。