Merge pull request heynickc#49 from Charismatron/master

Add Writing Great Specifications to books list

readme.md

@@ -51,7 +51,9 @@ The term was coined by Eric Evans in his book of the same title.
 - [Secure by Design (early access)](https://www.manning.com/books/secure-by-design?a_aid=danbjson&a_bid=0b3fac80) - Shows how to use Domain-Driven Design to avoid security vulnerabilities.
 - [Applying Domain Driven Design with CQRS and Event Sourcing](https://buildplease.com/pages/now-what/) - A walkthrough of using EventStorming and other modeling techniques to build a CQRS and Event Sourcing-based prototype for a fictional business domain.
 - [Versioning in an Event Sourced System](https://leanpub.com/esversioning) - Have you had troubles with versioning an Event Sourced system? Just getting into a new Event Sourced system for the first time? This book is the definitive guide of how to handle versioning over long periods of time.
+- [Writing Great Specifications](https://www.manning.com/books/writing-great-specifications) - Writing Great Specifications is an example-rich tutorial that teaches you how to write good Gherkin specification documents that take advantage of Specification by Example's benefits.
 - [The Semantic JavaScript Backend for Event-Driven Development](https://docs.wolkenkit.io/1.1.0/downloads/brochure/) - A 68 pages long free ebook on what DDD, CQRS and event-sourcing are, and how they fit each other.
+- [Specification by Example](https://www.manning.com/books/specification-by-example) - This book distills from the experience of leading teams worldwide effective ways to specify, test, and deliver software in short, iterative delivery cycles. Case studies in this book range from small web startups to large financial institutions, working in many processes including XP, Scrum, and Kanban.
 
 ## Training Courses