Implemented autoAdjustTrackColor
Implemented autoAdjustTrackColor

When animated popUpView colours are used, ‘minimumTrackTintColor’ is
continuously updated with the popUpView color.

alskipp/ASValueTrackingSlider,3squared/ASValueTrackingSlider,shenyuan000/ASValueTrackingSlider,elegion/ios-pods-ASValueTrackingSlider,jianyelijun/ASValueTrackingSlider,ezescaruli/ASValueTrackingSlider,hejunbinlan/ASValueTrackingSlider,puvanarajan/ASValueTrackingSlider,vantientu1703/ASValueTrackingSlider,vince4/ASValueTrackingSlider