CHANGES IN VERSION 0.0.7
------------------------
 o add parameter `sorted_by_radius`.
   + https://github.com/GuangchuangYu/scatterpie/issues/7

CHANGES IN VERSION 0.0.7
------------------------
 o add labeller parameter in geom_scatterpie_legend <2017-03-21, Tue>

CHANGES IN VERSION 0.0.6
------------------------
 o bug fixed of geom_scatterpie_legend <2016-02-14, Tue>
   + https://github.com/GuangchuangYu/scatterpie/issues/3

CHANGES IN VERSION 0.0.5
------------------------
 o add examples in geom_scatterpie <2016-12-02, Fri>
 o recenter to set the center of map data <2016-12-01, Thu>
 o geom_scatterpie_legend <2016-12-01, Thu>
 o geom_scatterpie <2016-11-30, Wed>