Merge pull request #6942 from eiipii/eiipiiVersion2ScalaClient

eiipii/etcdhttpclient library added to documentation on external clients

Documentation/libraries-and-tools.md

@@ -34,6 +34,7 @@
 **Scala libraries**
 
 - [maciej/etcd-client](https://github.com/maciej/etcd-client) - Supports v2. Akka HTTP-based fully async client
+- [eiipii/etcdhttpclient](https://bitbucket.org/eiipii/etcdhttpclient) - Supports v2. Async HTTP client based on Netty and Scala Futures.
 
 **Python libraries**