Add concurrency in Go

closes #54

README.md

@@ -180,6 +180,12 @@ In Black Hat Go, you'll learn how to write powerful and effective penetration te
 
 The main goal of this book is to help developers avoid common mistakes while at the same time, learning a new programming language through a "hands-on approach". This book provides a good level of detail on "how to do it securely" showing what kind of security problems could arise during development.
 
+### [Concurrency in Go](http://shop.oreilly.com/product/0636920046189.do)
+
+[<img src="https://covers.oreillystatic.com/images/0636920046189/cat.gif" width="120px"/>](http://shop.oreilly.com/product/0636920046189.do)
+
+Concurrency can be notoriously difficult to get right, but fortunately, the Go open source programming language makes working with concurrency tractable and even easy. If you’re a developer familiar with Go, this practical book demonstrates best practices and patterns to help you incorporate concurrency into your systems.
+
 
 **Web Development**
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