H2O’s rsparkling package link outdated

[robertowilliams]

Hi there,

The Rsparkling repo link (http://bit.ly/2z348qO) in section 1.5 needs to be updated:
"Rsparkling has been moved to Sparkling Water REPO"

The correct link is https://github.com/h2oai/sparkling-water/tree/master/r

Thanks,

Roberto