Change log for Chart::Gnuplot::Pie

0.04
    - NEW better test cases
    - CHG improve POD
    - FIX due to upgrading of Chart::Gnuplot

0.03
    - NEW Support customizing color for each slice
    - NEW Support customizing width and color of the border around and inside
          the 2D pie

0.02
    - NEW Support rotating 3D pie
    - FIX Draw the side surface of the 3D pie before drawing the top surface
    - FIX Label printing due to upgrading of Chart::Gnuplot

0.01
    Initial release