Gauge memory leak

When repeatedly updating the value of a gauge, memory is leaked. The following example leaks 100mb on my system every iteration.

Environment details:

OS: Linux x86_64, Java Version: 1.8 openjdk, Enzo Version: 0.32,

import eu.hansolo.enzo.gauge.RadialSteelGauge;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.stage.Stage;


public class Main extends Application
{
    private long lastTimerCall;
    private AnimationTimer timer;


    @Override
    public void start ( Stage stage ) throws Exception
    {
        HBox pane = new HBox();
        pane.setPadding( new Insets( 10, 10, 10, 10 ) );
        pane.setSpacing( 10 );
        final RadialSteelGauge gauge = new RadialSteelGauge();
        pane.getChildren().add( gauge );

        final Scene scene = new Scene( pane, Color.BLACK );

        lastTimerCall = System.nanoTime();
        timer = new AnimationTimer()
        {
            @Override
            public void handle ( long now )
            {
                if ( now > lastTimerCall + 1000000000 )
                {
                    gauge.setValue( Math.random() * 101 );
                    lastTimerCall = now;
                }
            }
        };

        stage.setScene( scene );
        stage.show();

        timer.start();

    }

}

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