Merge pull request #340 from philips/add-rthomas-clj-etcd

feat(README): add clojure client rthomas/clj-etcd

README.md

@@ -617,6 +617,7 @@ See [CONTRIBUTING](https://github.com/coreos/etcd/blob/master/CONTRIBUTING.md) f
 **Clojure libraries**
 
 - [aterreno/etcd-clojure](https://github.com/aterreno/etcd-clojure)
+- [rthomas/clj-etcd](https://github.com/rthomas/clj-etcd)
 
 **Erlang libraries**