Move from deprecated ESLint.CLIEngine

[sindresorhus]

https://eslint.org/docs/user-guide/migrating-to-7.0.0#the-cliengine-class-has-been-deprecated

https://eslint.org/docs/developer-guide/nodejs-api#eslint-class

This issue includes fixing this TODO:

xo/lib/options-manager.js

Lines 344 to 345 in 7344d21

	// TODO: This logic needs to be improved, preferably use the same code as ESLint
	// user's configs must be resolved to their absolute paths

[gitcoinbot]

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[sindresorhus]

// @Richienb In case you're interested.

[Richienb]

ok

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work has been started.

These users each claimed they can complete the work by 265 years, 7 months from now.
Please review their action plans below:

1) richienb has started work.

I will follow the instructions laid out in #474

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[fisker]

I tried to work on this few weeks ago, seems the new report and the old options are the hard parts. 😄

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work for 0.1308 ETH (333.08 USD @ $2574.87/ETH) has been submitted by:

1. @aadorian

@sindresorhus please take a look at the submitted work:

• PR by @aadorian

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[jhanschoo]

Just wondering, what does this mean for #483 ?