update link to Hands-On Programming with R (#981)

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@ -109,7 +109,7 @@ These mini languages help you think about problems as a data scientist, while su
We've made a few assumptions about what you already know in order to get the most out of this book.
You should be generally numerically literate, and it's helpful if you have some programming experience already.
If you've never programmed before, you might find [Hands on Programming with R](http://amzn.com/1449359019) by Garrett to be a useful adjunct to this book.
If you've never programmed before, you might find [Hands on Programming with R](https://rstudio-education.github.io/hopr/) by Garrett to be a useful adjunct to this book.
There are four things you need to run the code in this book: R, RStudio, a collection of R packages called the **tidyverse**, and a handful of other packages.
Packages are the fundamental units of reproducible R code.