Remove `--prettier-last` option because it's out scope

[JounQin]

@spudly @kentcdodds

Sorry, I'm a bit confusing here. You can always be able to implement this feature without 3rd-party tool/cli by eslint filePath && prettier --write filePath or eslint-plugin-prettier and the performance should be better. I'm not sure why you use prettier-eslint at all?

Originally posted by @JounQin in #58 (comment)

[JounQin]

I'm confusing about this because run prettier after eslint is very safe and compatible with eslint+prettier both together, while prettier-eslint is not compatible with prettier itself.

[github-actions]

Stale issue