Verbose mode

Would be useful to have an --verbose mode that outputs a lot of debug information:

• Which files are ignored by our default ignore filter
• Maybe the resolved ESLint config that is used?

What else?

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[marionebl]

Some ideas

• The entire eslint extends chain
• User-ignored files (as opposed to default-ignored ones)
• Applicable extensions

[ulken]

@sindresorhus What’s the status on this? Up for grabs?