fix label position
fix label position

DmitryNek/EFCircularSlider,rainkong/EFCircularSlider,matthewyan/EFCircularSlider,nagyistoce/EFCircularSlider,glt3953/EFCircularSlider-glt3953,neonaldo/EFCircularSlider,AlexanderMazaletskiy/EFCircularSlider,eliotfowler/EFCircularSlider,sidorov-panda/EFCircularSlider,SatoTakeshiX/EFCircularSlider