Add Let's Go Further (#98)

README.md

@@ -370,6 +370,12 @@ a solid framework to use as the starting point for future projects.
 
 Let's Go teaches you step-by-step how to create fast, secure and maintainable web applications using Go. It guides you through the start-to-finish build of a real-world application — covering topics like how to structure your code, manage dependencies, authenticate and authorize users, secure your server and test your application.
 
+### [Let's Go Further](https://lets-go-further.alexedwards.net/)
+
+<img src="https://lets-go-further.alexedwards.net/sample/assets/img/cover.png" width="120px"/>
+
+Let’s Go Further helps you extend and expand your knowledge of Go — taking you beyond the basics and guiding you through advanced patterns for developing, managing and deploying APIs and web applications. By the end of the book you'll have all the knowledge you need to create robust and professional APIs which act as backends for SPAs and native mobile applications, or function as stand-alone services.
+
 ### [Go Brain Teasers](https://gum.co/Qkmou)
 
 <img src="https://static-2.gumroad.com/res/gumroad/4733400574449/asset_previews/f58ea23cad3344595c2e73acdae29848/retina/cover2.png" width="120px"/>