Incorrect link to the new style guide

[bwaismeyer]

Just a quick note that the link to the new style guide (on this page: http://adv-r.had.co.nz/Style.html) is incorrect - it links to the advanced R index (https://adv-r.hadley.nz/index.html) rather than to the new style guide (https://style.tidyverse.org/).

Thank you for your patience - I'm a little rusty with my Githubbing or I'd submit a push request.