Merge github.com:bigstepinc/jsonrpc-bidirectional

Author: ionut.stan

README.MD

@@ -1,5 +1,6 @@
 # Bidirectional JSON-RPC 2.0 server and client
 
+[![Version npm](https://img.shields.io/npm/v/ws.svg)](https://www.npmjs.com/package/jsonrpc-bidirectional)
 [![Build Status](https://travis-ci.org/oxygens/jsonrpc-bidirectional.svg?branch=master)](https://travis-ci.org/oxygens/jsonrpc-bidirectional)
 
 A main goal of this project is to have the JSON-RPC server and client support __bidirectional JSON-RPC requests over a single WebSocket connection.__