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README's first example does not run as desired.

See original GitHub issue

The code I run is taken from README.md Basic usage with first line modified. It is

var stan = require( 'node-nats-streaming' ).connect( 'test-cluster', 'client-123', 'nats://localhost:4222' );

stan.on( 'connect', function() {
    // Simple Publisher (all publishes are async in the node version of the client)
    stan.publishAsync( 'foo', 'Hello World!', function( err, guid ) {
        if ( err ) {
            console.log( 'publish failed: ' + err );
        } else {
            console.log( 'published message with guid: ' + guid );
        }
    } );

    // Subscriber can specify how many existing messages to get.
    var subscription = stan.subscribe( 'foo' );
    subscription.on( 'message', function( msg ) {
        console.log( 'Received a message: ' + msg.getData() );
    } );

    // Unsubscribe
    subscription.unsubscribe();

    // Close connection
    stan.close();
} );

The result it produces

$ node a.js
Error
    at Client.publish (/.../node_modules/nats/lib/nats.js:930:15)
    at Client.request (/.../node_modules/nats/lib/nats.js:1123:10)
    at Client.<anonymous> (/.../node_modules/node-nats-streaming/lib/stan.js:254:13)
    at emitOne (events.js:96:13)
    at Client.emit (events.js:188:7)
    at Client.connectCB (/.../node_modules/nats/lib/nats.js:330:10)
    at /.../node_modules/nats/lib/nats.js:755:67
    at Client.processInbound (/.../node_modules/nats/lib/nats.js:725:33)
    at Socket.<anonymous> (/.../node_modules/nats/lib/nats.js:405:16)
    at emitOne (events.js:96:13)
Error
    at Client.publish (/.../node_modules/nats/lib/nats.js:930:15)
    at Stan.publishAsync (/.../node_modules/node-nats-streaming/lib/stan.js:410:11)
    at Stan.<anonymous> (/.../a.js:6:10)
    at emitOne (events.js:96:13)
    at Stan.emit (events.js:188:7)
    at /.../node_modules/node-nats-streaming/lib/stan.js:260:12
    at Object.callback (/.../node_modules/nats/lib/nats.js:1121:9)
    at Client.processMsg (/.../node_modules/nats/lib/nats.js:873:17)
    at Client.processInbound (/.../node_modules/nats/lib/nats.js:805:24)
    at Socket.<anonymous> (/.../node_modules/nats/lib/nats.js:405:16)
Error
    at Client.publish (/.../node_modules/nats/lib/nats.js:930:15)
    at Client.request (/.../node_modules/nats/lib/nats.js:1123:10)
    at Stan.subscribe (/.../node_modules/node-nats-streaming/lib/stan.js:493:11)
    at Stan.<anonymous> (/.../a.js:15:29)
    at emitOne (events.js:96:13)
    at Stan.emit (events.js:188:7)
    at /.../node_modules/node-nats-streaming/lib/stan.js:260:12
    at Object.callback (/.../node_modules/nats/lib/nats.js:1121:9)
    at Client.processMsg (/.../node_modules/nats/lib/nats.js:873:17)
    at Client.processInbound (/.../node_modules/nats/lib/nats.js:805:24)
Error
    at Client.publish (/.../node_modules/nats/lib/nats.js:930:15)
    at Client.request (/.../node_modules/nats/lib/nats.js:1123:10)
    at Subscription.unsubscribe (/.../node_modules/node-nats-streaming/lib/stan.js:587:19)
    at Stan.<anonymous> (/.../a.js:21:18)
    at emitOne (events.js:96:13)
    at Stan.emit (events.js:188:7)
    at /.../node_modules/node-nats-streaming/lib/stan.js:260:12
    at Object.callback (/.../node_modules/nats/lib/nats.js:1121:9)
    at Client.processMsg (/.../node_modules/nats/lib/nats.js:873:17)
    at Client.processInbound (/.../node_modules/nats/lib/nats.js:805:24)
Error
    at Client.publish (/.../node_modules/nats/lib/nats.js:930:15)
    at Client.request (/.../node_modules/nats/lib/nats.js:1123:10)
    at Stan.close (/.../node_modules/node-nats-streaming/lib/stan.js:299:11)
    at Stan.<anonymous> (/.../a.js:24:10)
    at emitOne (events.js:96:13)
    at Stan.emit (events.js:188:7)
    at /.../node_modules/node-nats-streaming/lib/stan.js:260:12
    at Object.callback (/.../node_modules/nats/lib/nats.js:1121:9)
    at Client.processMsg (/.../node_modules/nats/lib/nats.js:873:17)
    at Client.processInbound (/.../node_modules/nats/lib/nats.js:805:24)
events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: stan: invalid subscription
    at /.../node_modules/node-nats-streaming/lib/stan.js:592:26
    at Object.callback (/.../node_modules/nats/lib/nats.js:1121:9)
    at Client.processMsg (/.../node_modules/nats/lib/nats.js:873:17)
    at Client.processInbound (/.../node_modules/nats/lib/nats.js:805:24)
    at Socket.<anonymous> (/.../node_modules/nats/lib/nats.js:405:16)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at TCP.onread (net.js:543:20)