Update README.md

README.md

@@ -186,9 +186,9 @@ Free to [read online](https://thewhitetulip.gitbooks.io/webapp-with-golang-anti-
 
 Today, companies and developers need to respond to changing markets at breakneck speeds. Organizations that aren't built on highly-available, rapidly-evolving software are going the way of the dinosaurs. Cloud Native Go brings together the knowledge developers need to build massive-scale cloud applications that meet the insatiable demands of today's customers and markets.
 
-###[Web Development with Go: Learn to Create Real World Web Applications using Go](http://usegolang.com) 
+###[Web Development with Go: Learn to Create Real World Web Applications using Go](https://gumroad.com/l/web-development-with-go) 
 
-<a href="http://usegolang.com"><img src="http://early.usegolang.com/images/Cover300ppi.png" width="120px"/></a>
+<a href="https://gumroad.com/l/web-development-with-go"><img src="http://early.usegolang.com/images/Cover300ppi.png" width="120px"/></a>
 
 Web Development with Go was written to teach both beginners and experts how to create and deploy a real web application. You won't be building a boilerplate TODO list, but will instead be creating and deploying a production ready photo gallery application, similar to Pixieset, from scratch. The book assumes no previous web development experience and covers everything you need to know to successfully build your own web application.