Update books.md (#7397)

Author: rantri

docs/community/books.md

@@ -17,5 +17,5 @@ title: Books
 * [Functional Reactive Programming](https://www.manning.com/books/functional-reactive-programming) (Stephen Blackheath and Anthony Jones, July 2016)
 * [Functional and Reactive Domain Modeling](https://www.manning.com/books/functional-and-reactive-domain-modeling) (Debasish Ghosh, October 2016)
 * [Reactive Design Patterns](https://www.manning.com/books/reactive-design-patterns) (Roland Kuhn with Brian Hanafee and Jamie Allen, February 2017)
-* [Rx.NET in Action](https://www.manning.com/books/rx-dot-net-in-action) (Tamir Dresher, **Not released yet**, MEAP began July 2015 Publication in March 2017)
-* [Reactive Application Development](https://www.manning.com/books/reactive-application-development) (Duncan K. DeVore, Sean Walsh, and Brian Hanafee, **Not released yet**, MEAP began December 2014 Publication in Summer 2017)
+* [Rx.NET in Action](https://www.manning.com/books/rx-dot-net-in-action) (Tamir Dresher, April 2017)
+* [Reactive Application Development](https://www.manning.com/books/reactive-application-development) (Duncan K. DeVore, Sean Walsh, and Brian Hanafee, May 2018)