message: Fix examples in the README
diff: @@ -20,7 +20,7 @@ let connection = rpc.createMessageConnection(
  new rpc.StreamMessageReader(childProcess.stdout),
  new rpc.StreamMessageWriter(childProcess.stdin));
  -let notification = new NotificationType<string, void>('testNotification');
  +let notification = new rpc.NotificationType<string, void>('testNotification');
  connection.listen();
  @@ -37,7 +37,7 @@ let connection = rpc.createMessageConnection(
  new rpc.StreamMessageReader(process.stdin),
  new rpc.StreamMessageWriter(process.stdout));
  -let notification = new NotificationType<string, void>('testNotification');
  +let notification = new rpc.NotificationType<string, void>('testNotification');
  connection.onNotification(notification, (param: string) => {
  console.log(param); // This prints Hello World
  });
  