add country

Hi,
I would like to add a few countries to the provided list taking the data from http://jvectormap.com/

I see I can add a .js file to the plugin but i am afraid that all changes will be erased by an update. any way to do this?
I am more than happy to contribute my add-ons.

Thanks,
Steven

https://wordpress.org/plugins/responsive-vector-maps/