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When dealing with a huge library of SVGs, it's often difficult to see exactly which icons were optimised in the CLI output and by how much since there are a lot that were optimised by 0%.

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A new CLI flag and/or config property to hide any SVGs that were optimised by 0% in the output, so only the SVGs that were altered are displayed in the CLI output.

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There is a --quiet flag, but this hides everything. I'd still like to see the SVGs that were optimised.

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