Reduces cover image size and corrects book url in index.

Author: garrettgman

cover.png

@@ -3,7 +3,7 @@ knit: "bookdown::render_book"
 title: "Hands-On Programming with R"
 author: ["Garrett Grolemund"]
 description: "This book will teach you how to program in R, with hands-on examples. I wrote it for non-programmers to provide a friendly introduction to the R language. You'll learn how to load data, assemble and disassemble data objects, navigate R's environment system, write your own functions, and use all of R's programming tools. Throughout the book, you'll use your newfound skills to solve practical data science problems."
-url: 'http\://r4ds.had.co.nz/'
+url: 'https://rstudio-education.github.io/hopr/'
 github-repo: rstudio-education/hopr
 twitter-handle: statgarrett
 cover-image: cover.png