add target prop for opening in new tab

[patrickkamcord]

Adds a new optional prop "target" - useful for opening links in a new tab

[jakubwolny]

I'd suggest to add more generic way to specify any additional html attributes. That's how you can achieve target="_blank" or rel=nofollow etc.

What do you think about it @patrickkamcord @joshthecoder ?

[patrickkamcord]

Yeah or even a replacer function you can specify like the original autolinker this is based on: https://github.com/gregjacobs/Autolinker.js

That way you have full control.

[joshthecoder]

The ability to provide a custom factory function that returns the link React elements might be nice.
This might also pave the way for supporting other renderers such as React Native.

[jakubwolny]

I created PR with my proposal - I just added support for custom html attributes, I didn't have to time to create custom transformer for link elements. But this shouldn't be an issue to pass function as attrs and then transform it accordingly.

#7