Update README.md

Author: a-martyn

README.md

@@ -1,6 +1,6 @@
 # ISL-python
 
-[*An Introduction to Statistical Learning*](http://www-bcf.usc.edu/~gareth/ISL/) is a textbook by Gareth James, Daniela Witten, Trevor Hastie and Robert Tibshirani. Conceptual and applied exercises are provided at the end of each chapter covering supervised learning.
+[*An Introduction to Statistical Learning*](http://www-bcf.usc.edu/~gareth/ISL/) is a textbook by Gareth James, Daniela Witten, Trevor Hastie and Robert Tibshirani from Stanford University. Conceptual and applied exercises are provided at the end of each chapter covering supervised learning.
 
 
 <IMG src='http://www-bcf.usc.edu/%7Egareth/ISL/ISL%20Cover%202.jpg' height=20% width=20%> <P>