Mistake in readme

[kevrmnd]

Hi,

Firstly, thank you for the plugin, it works well 👍

I Noticed this mistake in the readme while using it :

scrollDir({ direction: 'up' }); // the default is 'down'

should be :

scrollDir({ dir: 'up' }); // the default is 'down'

Bye

[yowainwright]

Thanks @kevrmnd!