add `renderLastLine` method to overriding if it need

[thykos]

I use this component to truncating a text, and I need to use react-linkify inside. I can override renderLine for this goals, but I noticed that last line rendered with broken link, because of slicing text.

[moubi]

@thykos does the change with renderLastLine actually make any functional difference?

[thykos]

@thykos does the change with renderLastLine actually make any functional difference?

yes, if we use linkify and last line include link, link will be cutted and broken. With renredLastLine we can prevent broke