Update README for node.js environment instructions
Update README for node.js environment instructions

gutenye/rethinkdbdash-websocket,gutenye/rethinkdbdash-websocket-client,mikemintz/rethinkdb-websocket-client,gutenye/rethinkdbdash-websocket,udacity/rethinkdb-websocket-client,gutenye/rethinkdbdash-websocket-client,niieani/rethinkdb-websocket-client,ilsken/rethinkdb-websocket-client,babakness/rethinkdb-websocket-client