provided default size (square with 30% smaller than screen) for the FLChart, fixed issue #74.
provided default size (square with 30% smaller than screen) for the FLChart, fixed issue #74.

imaNNeoFighT/fl_chart,imaNNeoFighT/fl_chart,imaNNeoFighT/fl_chart,imaNNeoFighT/fl_chart,imaNNeoFighT/fl_chart,imaNNeoFighT/fl_chart,imaNNeoFighT/fl_chart