Update README.md

Author: VishalMewadaPackt

README.md

@@ -46,7 +46,7 @@ With the following software and hardware list you can run all code files present
 
 **We also provide a PDF file that has color images of the screenshots/diagrams used in this book. [Click here to download it](https://www.packtpub.com/sites/default/files/downloads/RDataStructuresandAlgorithms_ColorImages.pdf).**
 
-## Related Products
+### Where can you buy this book?
 * R for Data Science [[Packt]](https://www.packtpub.com/big-data-and-business-intelligence/r-data-science?utm_source=Github&utm_medium=Repository&utm_campaign=9781784390860) [[Amazon]](https://www.amazon.com/dp/1784390860)
 
 * R Graph Essentials [[Packt]](https://www.packtpub.com/big-data-and-business-intelligence/r-graph-essentials?utm_source=Github&utm_medium=Repository&utm_campaign=9781783554553) [[Amazon]](https://www.amazon.com/dp/178355455X)