Filter out `.gitignore` patterns before globbing #235

On a really large project it's very inefficient. See: https://github.com/sindresorhus/xo/issues/234#issuecomment-310542486

The .gitignore handling moved to https://github.com/sindresorhus/globby, so it needs to be fixed there.

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I think this is already fixed, should close.

@fisker Do you know which commit fixed it?

Maybe I fixed it? The old one only ignore DEFAULT_IGNORES, and I removed it, see this.

But I read the ignores config, and use it in another PR https://github.com/xojs/xo/pull/584/files#diff-e727e4bdf3657fd1d798edcd6b099d6e092f8573cba266154583a746bba0f346R154

Wait... No, this is the line glob files https://github.com/xojs/xo/pull/583/files#diff-e727e4bdf3657fd1d798edcd6b099d6e092f8573cba266154583a746bba0f346L164, I don't know.

Most likely this PR https://github.com/xojs/xo/pull/436

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