Add updatePlaceholder to placeholder's didSet
Add updatePlaceholder to placeholder's didSet

Without it, the placeholder is not visible when using Interface Builder. Placeholder is not set when the view is created and updatePlaceholder is not invoked after setting placeholder either in code or Interface Builder
BLVudu/SkyFloatingLabelTextField,BLVudu/SkyFloatingLabelTextField,Skyscanner/SkyFloatingLabelTextField,BLVudu/SkyFloatingLabelTextField,Skyscanner/SkyFloatingLabelTextField