Address issues identified by linter in SvgBuilder

[crishoj]

in src/SvgBuilder.php, line 69

TODO comments are left in the code when a feature (or a bug) isn't completely developed (or fixed). You should complete the implementation and remove the comment.

    /**
     * Changes the pen of the plotter.
     */
    public function changePen(int $pen): PlotBuilder
    {
        // TODO: Implement changePen() method.
    }

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