Update README.md

All of the associated R packages for the book can be installed trivially, since the book is a (sort of) fake package thanks to the travis-CI implementation.
2016-02-15 19:40:19 +00:00 · 2016-02-15 19:40:19 +00:00 · 0a6c0bda4f
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@ -17,3 +17,9 @@ knitr and pandoc. To create the site, you need:
 * bookdown: `install_github("hadley/bookdown")`
 * [pandoc](http://johnmacfarlane.net/pandoc/)
 * [knitr](http://yihui.name/knitr/): `install.packages("knitr")`
+
+The R packages used in this book can be installed via
+
+```{r}
+devtools::install_github("hadley/r4ds")
+```