Update expired link

The old link was expired and warned as phsing link. I updated the new link (licensed and free)
NicholasWilsonDEV · Nov 18, 2022 · e464450 · e464450
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diff --git a/r-resources.md b/r-resources.md
@@ -13,7 +13,7 @@ _[Note: The core of The Open Source Data Science Masters focuses on programmatic
 
 #### Basic Statistics with R
 
- * An Introduction to Statistical Learning [Book pdf](http://www-bcf.usc.edu/~gareth/ISL/ISLR%20First%20Printing.pdf) ^also a Machine Learning resource
+ * An Introduction to Statistical Learning [Book pdf](https://www.statlearning.com/) ^also a Machine Learning resource
 
 #### Data Science with R
  * Introduction to Data Science [Syracuse University / ebook](http://jsresearch.net/index.html)