Update TTRangeSlider.m
Update TTRangeSlider.m

- add minDistance and maxDistance
chengkaizone/TTRangeSlider,fiantinangon/TTRangeSlider,Instamotor-Labs/TTRangeSlider,protspace/TTRangeSlider,fiantinangon/TTRangeSlider,tianfan/TTRangeSlider,mikeMTOL/TTRangeSlider,mikeMTOL/TTRangeSlider,apaganobeleno/TTRangeSlider,fiantinangon/TTRangeSlider,WenryXu/TTRangeSlider,Instamotor-Labs/TTRangeSlider,apaganobeleno/TTRangeSlider,TomThorpe/TTRangeSlider,WenryXu/TTRangeSlider,apaganobeleno/TTRangeSlider,Instamotor-Labs/TTRangeSlider,chengkaizone/TTRangeSlider,tianfan/TTRangeSlider,chengkaizone/TTRangeSlider,mikeMTOL/TTRangeSlider,tianfan/TTRangeSlider,WenryXu/TTRangeSlider,protspace/TTRangeSlider,protspace/TTRangeSlider