Update index.Rmd

Author: mine-cetinkaya-rundel

index.Rmd

@@ -42,7 +42,7 @@ knitr::write_bib(c(.packages(),
 ![IMS1](images/IMS1_front_cover.png){.cover width="250"}
 This is the website for **Introduction to Modern Statistics**, First Edition by Mine Çetinkaya-Rundel and Johanna Hardin. Introduction to Modern Statistics, which we'll refer to as IMS going forward, is a textbook from the [OpenIntro](https://www.openintro.org/) project.
 
-The book will always be available for free here. It is also available in PDF (for free or for the amount you choose to donate to the OpenIntro project) on Leanpub and in black&white paperback for purchase for $20.
+The book will always be available for free here. It is also available in PDF (for free or for the amount you choose to contribute) on Leanpub and in black&white paperback for purchase for $20.
 <br><br>
 <a href="https://leanpub.com/imstat" target="_blank"><img src="images/_icons/file.png" width="30px">&nbsp;<strong>Download PDF</strong></a>
 <br>