README: Add link to blog post for 3.2.0

Fixes https://github.com/jquery/jquery/issues/3574

README.md

@@ -5,6 +5,8 @@
 For information on how to get started and how to use jQuery, please see [jQuery's documentation](http://api.jquery.com/).
 For source files and issues, please visit the [jQuery repo](https://github.com/jquery/jquery).
 
+If upgrading, please see the [blog post for 3.2.0](http://blog.jquery.com/2017/03/16/jquery-3-2-0-is-out/). This includes notable differences from the previous version and a more readable changelog.
+
 ## Including jQuery
 
 Below are some of the most common ways to include jQuery.
@@ -14,7 +16,7 @@ Below are some of the most common ways to include jQuery.
 #### Script tag
 
 ```html
-<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
+<script src="https://code.jquery.com/jquery-3.2.0.min.js"></script>
 ```
 
 #### Babel