On IOS, setting distance=0 does not work properly #63
Description
On IOS, if borderRadius is set in child‘s style, distance=0 will cause an exception.
<Shadow distance={0} startColor='#E43B5F' offset={[0, 4]}> <View style={{width: 100, height: 100, borderRadius: 50, backgroundColor: 'blue'}} /> </Shadow>
