Extending style props is not working

[agape-mou]

Hi, I really appreciate this library.

When I try to customize the rendering by using some props as textContainerStyle, it overrides the default value

[agape-mou]

One change I want to suggest.

Maybe we can move all defaultStyle in the styles object and in RNUrlPreview.defaultProps keep them empty object.
As you know if someone uses the props for example textContainerStyle, we can apply both styles :

style={[styles.textContainerStyle, textContainerStyle]}