Update TTRangeSlider.m
Update TTRangeSlider.m

- move leftHandSelected and rightHandSelected to TTRangeSlider.m (private to public)
apaganobeleno/TTRangeSlider,chengkaizone/TTRangeSlider,chengkaizone/TTRangeSlider,tianfan/TTRangeSlider,WenryXu/TTRangeSlider,chengkaizone/TTRangeSlider,protspace/TTRangeSlider,Instamotor-Labs/TTRangeSlider,mikeMTOL/TTRangeSlider,fiantinangon/TTRangeSlider,protspace/TTRangeSlider,tianfan/TTRangeSlider,WenryXu/TTRangeSlider,apaganobeleno/TTRangeSlider,mikeMTOL/TTRangeSlider,WenryXu/TTRangeSlider,Instamotor-Labs/TTRangeSlider,fiantinangon/TTRangeSlider,fiantinangon/TTRangeSlider,protspace/TTRangeSlider,apaganobeleno/TTRangeSlider,TomThorpe/TTRangeSlider,Instamotor-Labs/TTRangeSlider,mikeMTOL/TTRangeSlider,tianfan/TTRangeSlider