info: make --json a valid argument.

[MikeMcQuaid]

This is already accepted so let's handle this in the logic instead.

CC @chdiza @GauthamGoli for thoughts.

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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[MikeMcQuaid]

This actually doesn't work quite as expected: brew info --json wget works but brew info wget --json does not. @GauthamGoli any thoughts?

[MikeMcQuaid]

Thanks for the help @GauthamGoli. Pushed!

[GauthamGoli]

@MikeMcQuaid

$ brew info --json=v3 wget
Error: invalid JSON version: v3
Please report this bug:
  https://docs.brew.sh/Troubleshooting
/usr/local/Homebrew/Library/Homebrew/cmd/info.rb:91:in `info'
/usr/local/Homebrew/Library/Homebrew/brew.rb:89:in `<main>'

[MikeMcQuaid]

@GauthamGoli Fixed, meant to use UsageError.