Merge pull request heynickc#22 from eterps/patch-1

Adds a link to the Ruby DDD subreddit.

readme.md

@@ -72,6 +72,7 @@ The term was coined by Eric Evans in his book of the same title.
 - [DDD/CQRS Google Group](https://groups.google.com/forum/?utm_source=digest&utm_medium=email#!forum/dddcqrs) - An active mailing list and an excellent resource to ask questions and learn fine-grained details about DDD/CQRS.
 - [Domain Driven Design Yahoo Group](https://groups.yahoo.com/neo/groups/domaindrivendesign/conversations/messages) - This group is for discussion of the domain-driven style of designing software, and the book by Eric Evans, Domain-Driven Design: Tackling Complexity in the Heart of Business Software. Questions and discussion of the book content is welcome here, as well as sharing of experiences applying DDD, and discussions of the topic in general.
 - [DDDinPHP Google Group](https://groups.google.com/forum/#!forum/dddinphp) - The place to discuss Domain-Driven Design, CQRS, Event Sourcing, Model Storming, Hexagonal Architecture, Distributed Systems, Reactive... in the context of PHP.
+- [DDD in Ruby subreddit](https://www.reddit.com/r/ddd_ruby/) - A subreddit for Ruby developers interested in Domain-Driven Design.
 - [EventStormers Google+ Community](https://plus.google.com/u/0/communities/113258571348605620818) - A public discussion group for everybody interested in EventStorming, and related themes.
 - [DDD/CQRS/ES Slack](https://ddd-cqrs-es.herokuapp.com/) - A slack team for those who want to chat about Domain-Driven Design, CQRS, Event Sourcing and sometimes random things. Main channel is language and framework agnostic.
 - [Stack Exchange](https://programmers.stackexchange.com/questions/tagged/domain-driven-design) - Stack Exchange questions tagged *domain-driven-design*.